What do i do when i know there is something wrong with my love life?

Am 20 yrs old and i am engaged. We have been with each other over a year and also enaged. Some times we get along great then other times its war. We both have attckaed each other in the past but then we agreed a fresh start as the past is the past right? But he always casts up the past,calls me all types of name like “Slut,Whore,Bitch,Dog” and it actually makes me feel so small. Then the next morning it will be “Sorry babe i was i a bad mood you know i love you and would never leave you , i couldnt live with out you” yeah it sounds a shame on him but going through that its mental torture. If anyone has or been through the same kind of thing yous are not alone.x