Its the other way i guess where You dont wish to let yourself go. So just let go and see if you are able balance n stand alone.
Tell him!! Only way forward that I can see for you!!
If it's bc you're doubting you can fix something, and you're doing it for her, then you are quitting. I know, bc I almost did that, and I was finally able to fix the problem and I'm forever glad that I didn't do it.
You have to let him go if it is something you should do