Do I go with my heart or my head?

Okay me and my x was together a year and a 1month. We broke up @ the end of april. We stop talkin 4 a while until the 1st week if june. When we did start bacl talkin he was like he miss me n alot of stuff. So we kinda like talk n then stop talkin but 2 get to the bottom Line the reason we broke up is bc he wasn't faithful he claim he was but i got proof that he wasnt. So Like 2 weeks ago we started talkin like everyday and he started tellin me like how he reallt felt that he still loved me and how he wanna b with me n i mean 1 nite he was even cryin. So i mean i started havin mi emotions 4 him again i thought about givin him anotha chance but like tha next dai sum gurl called mi phone 4rm his phone questionin me bout me n him. So i really dont know wat to do im confused between mi heart which wants him back and mi head that says go find sumbodi better