Cheating

So I have been with my boyfriend for 4 years. We have been butting heads recently. He has cheated on me twice before, but those days are over (I hope). But now im having temptation with a guy I’ve been friends with. The guy was there for me when he cheated on me and has always been there for me. I have never had sex with anyone but my boyfriend. But now I cant stop thinking about my guy friend that has been there for me. He’s willing to fly me to him just to spend time which may lead to sex but yall I am not cheater but I want to have sex with someone else just to see how I would feel. Please help me😭😭