I'm glad you're thinking about what you want to ask yourself rather than focusing on your boyfriend's behavior. That is a really smart choice. Here are the questions I'd ask myself, if I were you:

Can I live without sex?

You have to respect your boyfriend's decision to be a born-again virgin, but you also want to figure out what that means to you. Are you going to have to go cold turkey?

I agree. Having sex and being sexual are not the same thing.

I'm not sure how you define "sex", but there are activities which your boyfriend might find acceptable that are also sexually satisfying for you. Some could be downright enjoyable, not to mention safe. If ALL sex is out, you need to decide how important that part of your relationship is.

Do I trust him enough to continue the relationship?

I agree. I wonder why he is suddenly renewing his vow now.

Why didn't your boyfriend tell you about his vow?

Why did he break it in the first place?

These are some issues you may want to talk over with him. You need to have a lot of trust to make a relationship work. I'd venture to say that you need trust even more than you need sex.