I know he cheated once,but Im still with him,but paranoid all the time!Should I 4give & 4get?And how?

We havent really spoken about it,but I think he knows I know. Because Im always throwing weird comments and hints. And when a friend of mine found out her boyfriend was cheating I spoke to my bf and was like..."Why do men cheat?" "I would never do such a thing" "Look how hurt she is"...I guess subtly putting a guilt trip on him. Im always checking his phone when he's not looking,u know doing weird stuff thats totally out of character and making me question if Im going crazy. I was never jealous before, I trusted him completely,but when I found out, it was all crushed. But I still love him, and I know he feels strongly about me and he made a mistake. Forgive and Forget? I just dont know...