do second chances exist?

Sammy
My boyfriend cheated on me and had been lying to me about numerous issues but silly things, of course, I love him & want to fix things but would rather move on if I knew he would do it again.
He cheated on me with his ex girlfriend, but over the phone. ( of what I know and saw) 
I broke up with him immediately but recently started seeing him again and very hesitant on how to save my self from hurt, I am willing to work on things and move forward but can I trust him.