Is it really a big deal when someone cheats on a significant other? Should cheating just be accepted?

I have never been in a real relationship but from what I see, cheating on spouses is pretty common. From what I can tell, pretty much everyone cheats at some point. Since I’ve never really been in a relationship, I don’t know how I would feel if a boyfriend/husband cheated on me. But sometimes I wonder, is it really that big of a deal if your partner just wanted to be with someone else and had sex with someone else. That doesn’t mean they don’t love you or care about you anymore. I know people who say they would never stand for someone to cheat on them but when they are cheated on, they remain in the relationship. Is it a bad idea then to agree from the get go that you don’t care if one of you has sex with someone else every once in a while (as long as you’re protected). Thoughts anyone?

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