Focus - yes you can. You can cope. Please don't tell yourself things like that. This road leads to depression! I don't want that for you - you've been doing so very well.
It's upsetting when H re-enters the picture. You've been a part of his life for so very long it's bound to happen. You cannot let these small interactions bring you down so far.
Are you talking to an IC? Lately, your posts are getting darker and darker. I'm really starting to worry about you, and am not sure you're getting the support you need to work through all this.
If not, please set up an appointment soon? It won't take much to have you feeling much better again - but if you do nothing - it's not going to take much for you to start feeling even worse.
I care, focus. I'm not the only one. Your first priority is you. Please take care of you.