Is my wife cheating on me?

I need a non bias answer to a very serious situation! I call it serious because there is a 3 year old little boy and a 7 year old beautifal girl involved. Okay! Here it is! My wife has been picking fights with me and leaving the house lately. Sometimes she doesn’t even pick a fight, she just leaves the house. She stays gone for like an hour or two then comes home. Our love life has died down also. She used to complain that I don’t come on to her enough, but recently I have been coming on to her and she has rejected me telling me it is because it is still that time of month. For two weeks she bleeds? I find that unusual. This is the way it has been for the past month and it is getting worse with her staying out for 3 hours and sometimes 4. She is getting some of "Me Time" she says. So now here is the final conclusion.
Mothers Day weekend I go to get some "Me time" and she seems upset about it. I was just wanting to go watch the UFC fights. She seemed real down so I invited her and she turned me down and told me that I didn’t really want her going with me. I told her that I would rather her go and she puts a sudden grin on her face and tells me to go have a good time and she is going to stay home with the kids and visit with her Dad. Her Dad gets there and I leave. One hour later my Daughter calls me and says Mommy left with one of her friends. It was the girl down the street. I talk to Her Dad and he said that he is watching the kids because she left upset with me. She didn’t take her cell phone so now I am really freaking out. About an hour goes by and she calls me and tells me she went to the grocery store with her friend, but she is going to stay in the rest of the night. The next day is Mothers day and I pamper her while she complains about everything and rushes me to do what ever she wants, because it is her day. I bent over backwards to give her the best Mothers day ever! By the end of the day she tells me that it was a perfect day and she even calls her friends and Sister to brag how she was a princess. The next day I kiss her goodbye as I leave to work and what happens next you won’t believe!
An hour after I leave she calls me and tells me she loves me and that she is going to take a shower and get up. I thought she hung the phone up but she didn’t. I try to talk to her because I can hear wind from outside and what sounds like voices. I listen closer and it is her and some guy talking about things that are inside of my house. I recently through out some clothes and displayed some of my knives and she was mentioning my clothes to him and asking if he needed any. He said that he was a size 36 and he couldn’t fit in any. She laughed and said," You aren’t a size 36." He laughed and asked about what a knife was for, and she said,"To stab my husband with." he replied with,"That is sick." Then I heard something which sounded like kissing noises, smacking or sucking. At these times there was no talking. He asked her something I couldn’t make out but she replied with," My husband is banging the local tramp in the neighborhood." I heard another more comotion and movement and she asked him why he didn’t say hello to her last night when he drove by. She then said," you don’t want to talk to me when my husband is home hunh?" He kept being cold in his tone while she was being eager to throw me under the bus to get his attention towards her. I hear more wind and then the phone line cutts off.
I am at a loss on what to do, so I call her immediately and she refuses to pick up! I call her back to back for the next 10 minutes. She finally texts me with " What is it Hunny." I text her back and ask her if she loves him or is it just lust and I ask who he is and is it worth the family splitting up. She immediately calls me and says ,"It was all a joke Hunny! I knew you were on the phone the whole time!" She then tells me that she wanted me to feel hurt for once because all the hurt I caused her in the past. She mentioned the first year we knew eachother and the games being played at the time. She mentioned me going to the UFC fights. She also tells me that I am never home because I am working longer hours. She goes on and on about the fact that she needs to be smothered consistantly and I am not as close to her and she feels I don’t love her. Then she tells me that if I don’t believe her about it being a prank, then it is over and she will pack up and leave. She hangs up on me so I call her and she tells me that we need a break before she does something she regrets! I ask her if she has cheated yet, and she said that it was a sick joke to wake me up and get closer to her. She then tells me it was wrong but if I don’t smother her every minute of the day, then she might do something she regrets, which means cheat! I asked her if I smothered her would she ever cheat? She swore
She swore to me that this is all she wants and that she would never hurt me if I am showing that consant love! I am now at a loss on what to do?
She is going to take this to her grave because I feel the phone call was real and everything that happened was real, but here she is now telling me that it was a sick game and she is sorry and she will not leave the house anymore and she will not go out without me anymore. I love her and my kids and they deserve Mommy and Daddy together! So I need a Non-Bias opinion on what to do and what do you think about the whole situation?

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