sexual standards

My boyfriend said I'm "dirty and used." What do I do with that?

I’m eighteen, and I’m madly in love with my boyfriend. We’re supposed to get an apartment together in December and I feel like I could spend every day of my life with him. I’ve been with a few (ok, 6, or 5, depending) guys before, and one night he got trashed and told me he would never marry me because I’m “dirty and used”....