Obviously you still love this man and/or still IN love with him.  It's easy for others to just say "leave him" but honestly, when it comes to matters of the heart, that decision or option is not that easy or cut and dry.  You do have 3 other major options though: 1. Seek counseling (might work, might not but worth a shot if it's affordable) 2. Beat yourself up wondering what you did wrong or if you did something wrong or 3. Cheat on his a$$ and see how he feels about that. I've found that option 3 gives the greatest results (positive and negative) but the fact remains....NO ONE LIKES TO BE CHEATED ON.  Especially the person that cheats first.  "Just a thought, just a thought" (quoted by Halle Berry in Swordfish)