Is my girlfriend cheating on me or are we falling out of love?

I am 28 yrs old and my girlfriend is the same age and has a 18month son. We have been going out for 9 month now. When we first met it was amazing we where in love everything was great our relationship was great, sex was great we couldn’t keep our hands away from each other.
i really Love this girl and her son, my parents however see it differently they are all against me being with her, but this has not stopped me from loving her and being with her.
The last couple months i would say from Jan to march everything just went down hill, all the affection stopped being physical went from everyday or every other day to once a week, she used to tell me how much she loved me and how i made feel while we made love all that was gone. The recent months passed we have only been physical once a month if so much, she doesn’t hug me, kiss me or smile at me anymore. We used to sleep in each others arms all that is gone, so much has changed. If i try to kiss her she moves her face, or keeps her lips sealed, tried to be intimate with her last night she kept moving her face away from my kisses, she told me to stop. I don’t know if i am being paranoid, or if shes cheating on me or out of love with me. Last night she silenced a call when we where together i don’t know if that has to do anything with it, but i took the number and called it, it was some guy he sounded old so i don’t if it was a family member.Please somebody give me some advice, i really don’t know what to do.
We dont live with each other ,she lives on one side of the country and i line on the other, so cooment of maybe we are seeing too much of each other i doubt that is the reason. i see her 2 to 3 times during the week and spen the weekend from sat to sun at her house

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