Cheating

my husband cheated last yr and i just found out. he has been working hard to gain my trust and has become an open book in the last  couple of months. he said he dont want to throw away 13 yrs when i threaten divorce so he is goim to indidvual n couples counseling. do u think he is complacent n don't feel like starting over and only here because he is use to me or should i forgive because maybe he really wants to make it work cause he wants to be here? i feel like he is doing all this because he afraid of chg possibly- like gettim a divorce n startin over