My husband is addicted to pornography and has several “relationships” online.

It sounds like he is also manipulating you through threats of self harm if you leave him. All of this sounds like emotional abuse and a very toxic situation.

I read you plan to leave in 6 months if things don’t change. That is a nice compromise, but it seems likely that the behavior will not change.

Do yourself a huge favor and leave now while you are still young and vibrant. You are absolutely better than this and you will find someone who treats you as such.
Love yourself and you will find love.

If you leave sooner rather than later, I think you will look back on your decision and be grateful. He will sort out his demons (or not) and that part of his life journey is for him to navigate.

/r/Marriage Thread