I love my boyfriend but yet i reeeaaalllyyyy like this other guy!!!?

Ive been dating this guy for a year and a half. And he wants to spend the rest of his life with me.And not too ago i did too...Then i found out that a guy i liked a lot before i met my current boyfriend was gunna ask me out..and my boyfriend dumped me once and begged for me back and i still loved him so yah i saud yes..and i told him if you hurt me again im done...and hes hurt me a lot but i just ignor it..then this other guy who is soo sweet hes my best friend and he knows me soo well... my boyfriend knows me even better... i play sports all year and i get hurt a lot because im just active... and this guy is always there for me... when i dislocated my shoulder he was there to hold me and make it ok...when i broke my ankle he didnt leave my side..and recently when i rolled my ankle he and my boyfriend carried me and both sat next to me the whole rest of the party to make sure im ok....im sooooooo torn..this guy says the sweetest things to me but my boyfriend really loves me...part of me just wants to give him a chance but im afraid that he will dump me after a few weeks..cause he is a short term relationship kind of guy and im such a long time relationship girl. So if he dumps me i will want my old boyfriend back and he wont take me back after i left him... so what do i do? leave the guy that says he wants to marry me some day or go with the handsome sweet heart that hasnt had a long relationship? hes my best friend too when i talk to him about the mean things my boyfriend says he says things like a man should never treat the women he loves like that... is that a sign? just i need some advice cause im honestly torn