This is ABSOLUTELY ridiculous. I'm sorry. You should not let someone treat like that. You haven't told us if you were unfaithful in the past, but it doesn't sound like you were, and I can't think of any other way your so-called "boyfriend's" behavior could be justified.
Are you sure you aren't confusing "love" with dependence or a desire for acceptance? I have done this before, so that's why I'm asking...

If you are young, I can't imagine how your bf's controlling and degrading behavior may change into something very bad as you get older.
Honestly, if it were me, I'd do whatever it took, break my own heart, to get away before he did any more damage. I'm just being really straightforward. I'm not trying to be mean or not understand you or belittle your feelings, but I think we all see where this could be going....