At what age should I be able to pull my foreskin back

This is perfectly normal for about the first 2 to 6 years. By around the age of 2, the foreskin should start to separate naturally from the glans. The foreskin of some boys can take longer to separate, but this does not mean there's a problem – it'll just detach at a later stage.

Explanation:

if your boyfriend is cheating on you, my best advice to you is to dump him, he's only going to drag you down. and if you do, don't fret there's plenty better that know how to treat a person right. i mean honestly, the whole point of a romantic relationship is love, and if you love someone you aren't going to cheat on them. i do believe in second chances, but why would he cheat in the first place? i personally feel that if someone cheats, they ruin any chance they wanted/had with you. i wish you the best of luck with this, hang in there.