Venting about my now ended Marriage

I don’t hate him even though I should. He chose to pursue another girl and then perceed to act like he cares about me. You can’t be torn between your wife (of 3 years) vs your co-worker (of a month). So I decided to make the choice for him, and get him to sign the papers. I tried so hard to fix it and he didn’t try at all. He decides that something new felt better because he wasn’t doing the right thing to make either one of us happy. Just added stress. I should be happy to get rid of him. But I’m so hurt. This freaking sucks. But now it’s time to work on me...