Lad, your relationship will suffer if your lives are suffering. Do your best to look after yourself, it's fine to be alone and to want to be alone, don't worry so much about the relationship but more the health and well-being of you two. Reflect and make a plan towards getting out of this situation.

It might be a brilliant idea to tell your girlfriend that you feel depressed and unable to talk to anyone.

>>3255 Unhealthy people have a heard time having healthy relationships, it's true.

Push yourself, OP. Fight against the depression for your sake and for hers and for the sake of your relationship. Do anything and everything you can to keep some of your life out from under the shadow of depression—or seek help if you need it, from talking to a friend to engaging the services of a professional.

Also, you need to communicate with your girlfriend. That's an absolute. Even if, as said, it's just to tell her that you're really depressed and feeling antisocial.