Re: This is killing me
are you worried that infidelity will continue/escalate?
Once may be forgiveable, twice ... How far did it go the first time? COULD he have slept with her? WOULD he have if he hadn't been caught? Did you find out or did he confess?
It's a tough thing, but do you want to spend the rest of your life wondering if he's running around on you? If he were to sleep with someone else, it would not only be a terrible betrayal but also put your health at risk (STDs) - is that worth it?
When you talk about it, what does he say? Is his behavior generally inappropriate when he's in "tempting" situations? Have close friends or family noticed such behavior if that's the case?
You say you got together young - how young? Is your sex life generally good - for both of you?
Remember, wanting to forgive someone and being able to really do it are two different things. You can't MAKE yourself feel something you just can't - love, trust, forgiveness. And not being able to forgive something that big does not make you a bad person.