What should i do if i think this?

What if i think my neices will go out with my boyfriend if i break up with him..cuz i think i he doesnt like me. cuz one of my neices have gone out with 3 of my ex's and my other neice has gone out with one...what should i do.? cuz he treats mel like nothing..to think i put friends before him which i mean i will admit i do sometimes but him..he would tell me to shut up in front of his...he always starts fights when theyare at his house...he would tell 4th GRADE sluts that they are fine and hott..and we are going into 7th.!! so i really need advice.! please.