You need a consult with a lawyer just to be educated on your rights & to give you an idea of what the financial side might look like. You don't need to say a word about this to your H, just be informed. Then you need to focus on you, how is your social life? Hobbies? Interests?
Take the focus off of H and put it on you! Make yourself a woman only a fool would leave.
Me: 35 husband:39 Sons 16 and 11 from my first marriage Twins 5 (boy/girl) Daughter 3 Affair bomb 2/27/14 He moved in with ow 3/13/14 OW kicked him out 6/15/14 4/2016 he seeks help for sexual addiction