Answer:
It's really hard to forgive him, i went through the same thing but with my mom cheating on my dad, they got a divorce when i was nine. I loved her and i couldn't forgive her until i was 17. Everytime i saw her i just remember what she did. But you have to wait till he apologize and explains himself, and until then it will be hard. the reason i forgave my mom was because i missed her and she explained everything and really apologized to the point where i could feel her pain..