Hi there Halpinio,
First of all welcome here.
I am not in a relationship right now, so I don't have that problem to figure out, but I can see how difficult it must be. As you can see from the posts above there are people here with similar experiences.
When I had a breakdown last year and brought up all my responsabilities, love and guilt towards my son, the therapist said I should learn to take care of my(emotional)self first.
Hope you find your way.