I don't think you can ever truly forgive them, but time does help you forget the cheating. My husband did it to me before we got married, but after a lot of soul searching I realised he was the man for me and I know deep down he won't do it again, especially as he had it done to him before we first got together.

It really depends on the person and how you handle things, but with me, when my boyfriend cheated on me, I found easier to forgive him after we talked, I had alot of questions, some stupid ones that I wanted to know, eg. when, where, who, etc once I knew all the details, I found it alot easier. Also time is a big healer, and if your boyfriend, like mine, was genuinely sorry, he will stand by you and reassure you for how ever long it takes for you to give him