There is no way to positively know if your boyfriend has cheated on you unless you catch him or he tells you. There may be some signs such as not being where he says he is or lying to you on who he was with.
Chat with our AI personalities
You have to ask him.
Usually if she's prettier than you.
she wondered in the kitchen to get food for her boyfriend
It is possible if consistently done.
Ask him. He'll know.