Living in remote community isolation, can't make friends, while managing a rocky long distance relationship
I feel for you, but I dont have much to offer.
If I was to place myself in your shoes, I think I'd move on from that relationship due mainly from its complexities. His mum, work ethic (good but too much) and distance.
With depression we should not underestimate it. We need to make wise choices.
If you break free spend some spare time and money on yourself, a resort or where there's night life.
That just my view. Also keep regular GP visits. Get that check up and discuss your depression.