My bday is tomorrow and I feel depressive

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I've joined college this year and my friendship with my old classmates changed completely. We lived a bromance and considered ourselves best friends forever, but now it looks like forever is over :'(
Now I only talk to a depressive guy who also used to be my classmate (but not really my friend) who doesn't want to socialize with anybody. I feel like I can't talk to other ppl because it would be mean with him, or something like that. I'm kinda getting his depression to me.

Another thing that makes me sad is having no girlfriend. I had one, she was super hot (in my pov) and really loved me, but was also super jealous and crazy... I broke up with her myself because of that.
She used to talk to me every week after we broke up but she stopped doing that last days and I don't know why. She wanted me to be her bf again, but I thought I didn't. Now that it seems that I lost her, I want her so hard...
Being lonely won't change so quickly, because there are pratically no girls in my grad course.

There are a lot of other reasons to make me sad but I consider these as the main ones. It lets me down in a day that was supposed to be happy: my birthday.

I know that my text was gay AF, but I really want some opinions and advices to maybe make me feel better. You can also say fuck you to me, just talk to me plz.