Should I give him another chance?

Hey my name is mayra im 16. My boyfriend(luis) is 19 I met him cause of my bestfriend they are sibilings.. Since the day I met him he showed intrest on me, I had a boyfriend at that time but he also had a girl(vanesa).. We kept communication for a couple months but then he found out his girlfriend was pregnat but at that time he also found out she was seeing other guys and it wasn’t just a friendship thing. She confessed to be having some sort of romance with somedody else..and that when he came along looking for me.. At that time I had no one in my life.. We satrted dating and I catched some kind of stong feelings for him but theres a bby in between.. We still kept our relationship moveing.. He seemed to be the right guy.. But in every family event I would go to it seemed like if I was only his sisters best friend nobody seemeed to know we were dating, and every time I tried talking to him he would answer quickly and move away. After a while I noticed he was trying to hide me from his family..so I kind of tried to get him out of my system.. So this is when the problem stars.. Back in my freshmen year I met the cutest guy ever(manny). Like 3 wks ago I saw him at a party I got his number and we started talking my boyfriend found out over myspace and without any questions left me eventough I’ve been having a crush on manny, my boyfriends reaction really hurt me.. His sister told me not to worry about anything because he had been seeing his bbys moma…and he even took her to his uncles weding sumthing he would of never done with me…he said his siter is lieing that she has always been a liar… I obuisly don’t wna belive him but he has not been the 1st person to tell me not to trust my besst friend but it hurts me more to know she lied… My boyfriend wants me back but I dont know what to do… Should I give him another chance?? Or go with the cutest guy ever?? P.s he looks like t.I … Please I need advice.. Help!!