My young adult son is depressed and not talking to me.

I am heartbroken. For the tough time he’s going through and for our relationship.

I’m trying to not make this about me but honestly, this is not how I envisioned our relationship. He has a masters degree and a live in girlfriend who is a doctor. He lives about 5 hours away from me. So there’s not a ton I can do and I just don’t know what to do. I vacillate between concern and disappointment. He won’t answer texts or calls. I miss him so much and worry about how he is doing. We’ve had such a nice relationship until this past year. I cannot imagine this playing out for years. He’s such a cool guy. So smart and just a great person.