How do you rebuild a relationship when trust is lost?

I know most women are going to say “well don’t be in the relationship anymore if trust isn’t there” and I’ve already thought that through-believe me. But I feel as though my boyfriend is worth it and that he is the man I’m supposed to be with so what I’m asking is if we’re going through a rough patch right now where I’m trying to trust him again... how do I go about this? If anyone’s gone through something similar before, how did you go about it? And were you successful?