Boyfriend trouble, advice? :/?

ok so me and my boyfriend have been dating for almost sa year, but in that time he has broken up with me like 3 times for another girl who was moving faster( nude pics, handjob,etc.) one night when he was with her he was texting me freaking out because she wanted to go to second and third base and he hadnt yet, so he broke up with her, and right now we are back together but she always texts him saying ilove you and lets kis but she knows we are datingg! and im really confused what to do because he has mood swings kind of like a pregnant ladyyyyy! its annoying! and then he calls this girl a ***** but takes it back and its crazy but we havent even kissed yet so should i stay withh him? and we are the same age but he is gonna be in highschool and ill be in eigth gradee! thanks for the help guysss(: