i'm confused...do i take him back

"I try to forget everything, but I just cant forget bout u"

"Look, I care about u more then u can imagine. "

thts two lines from this really really long email my ex e-mailed me....and well we're still friends...but wen me and my old bff were friends he used her...to his advantages and i kinda confronted him...and i'm worried if i take him back if he'll hurt me....too....what do i do....im sooo confused...