Infidelity Support Group
Any relationship in which one partner engages willfully in sexual relations with another outside of the partnership is considered to have experienced infidelity. This breach of trust is often traumatizing for the faithful partner as well as the relationship, and support is often needed to heal emotionally and to decide whether or not the relationship should continue after...

But I agree, you should make sure you give yourself time to find inner peace and heal.
Toxic at best - if you found someone else that makes you happy - that is a good thing - will he like that you are happy? hell no - will he try and bring you down to his level - heck yea.
Will he stop trying to mess with you? probably, he will give up at some point and then hopefully he will focus on himself and fixing himself.
That is what he really needs to do (fix himself). All you can do is disengage with him and try to be nice to him cause he is most likely in his own hell.
In my opinion, for personal sake, starting a new relaaitonship while still healing from another is a bad idea. It's like putting a band aid over an infection. Just because you don't see it doesn't mean it's not there. You have deep,wounds that need healing and while this new guy may have helped you and been supportive, I'm guessing there is a lot of stuff you have burried beneath the surface for survival sake.
I hope you are in counseling and really working on healing the wounds your H caused. Also any wounds that allowed you to be with somebody like him. Sometimes it's better to learn to stand on your own two feet before you bring somebody else into your life.
Would you rather not be happy? I ask myself that every day and because there are kids involved and quite honestly I cannot afford another house payment, If is was not for the kids, I would have left Aug 2007. I would have walked out of her life and started living the way I should, with a woman that loves me and is glad to have a man that would do anything for her.
...then I would snort laugh and hang up the phone.
L~
You're not cheating if you have filed for divorce. Don't feel guilty about feeling good.