I need help..

Hey, so I've been dating this guy for two months but I've known him for years on end and fell in love with him last October.. I can remember when I did but at the time he had a different girlfriend.. He's my absolute best friend and I trust him with the world.. He's my everything and I'm so incredibly lost right now.. So Sunday was our two month kinda thing, and he cheated on me.. he didn't like go out and sleep with another girl, or anything, but he was sending dick pics to another girl.. a girl I know whom sent me the pictures he sent her.. he admitted it to me the night he done it, but first he lied to me and denied the whole thing.. when he finally admitted it I had a full blown panic attack and I was crying and everything.. he cried too. And he promised me he would change and that this would never happen again, that it was an mistake that he regrets and he did as soon as he sent the picture.. so am I wrong for taking him back? And believing him when he says that he won't ever do it again..? Opinions please..?