Boyfriend Delima

Ashlee • Not trying to get pregnant, just like the ovulation tracker.
I have recently been concerned about my relationship. I have been with this boy for almost a year now. We have been sexually active for quite a while (not that that pertains to what I'm talking about). 
I think he feels that I worry about him to much. I've started to back off now but it's not in my nature not to care. He has also called me a bitch to two of his friends in the last two days, even when we got in an argument about it. I just don't feel comfortable with being called names. 
I'm not sure how to get the point across to him that it's not okay to talk behind my back.