Jazper,
It sounds like your depression might be a process of disengaging from these people who are hurting you. It sounds like you would like to end some relationships here, but your reluctance to hurt them is an obstacle. By focusing on your belief that they don't have the same concern for you that you are showing to them, you are slowly, bit by bit, undoing your attachment to them.

When you say you are questioning what is real, it sounds like you may be reworking your view of how to see things, and while this reworking process is taking place, it's not clear what is real and what isn't.

I think after the depression has run its course, you will have a new view of reality and you will be able to clearly decide once and for all whether you want these people in your life or if you are, in fact, ready to leave and start working on building a new social circle.