confused

so yah, im not having the best of luck latley, like the other day i found out that my boyfriend (who i was sapposed to move in with in a couple of days)had cheated on me more then once with, and the first time he did it i was there with him at a party and i was wondering why his best friend jumped me..it was all because she didn't want me with him she wanted her best friend with him but the sad thing about her jumping me is that im only 15 and shes like 25 haha and i still kicked her ass woot woot anywho lol.....so yes and way before all this my boyfriend well i guess i should say ex boyfriend crashed my grammas car well i was with him and almost killed me after he got me to steal it in the first place fuck im retarted ...so yah then his friend tells me that when he asked him if i was hott he said "well shes nothing specail but she gives me something to do and beside if i keep her happy i wont have to pay her grandma back for the car" and he calls me a bitch to them and all this shit like ii just dont know what to do with him weather i should be with him or not ? he said that he never said that about the car thing but he did admit to saying that shit about me but he siad he didn't mean it, it was kinda just like locker talk with the boys :(....and then after all that i hear that my step dads getting rid of my dog on me and i just need himm to keep her for like 3 more days till i can go pick her up and then after even all that i hear that my favriote uncle got hit by a car and died like what the fuck my head is so messed up right now and i have no clue what to do