I'm gonna try to give you a serious answer here pal without being condescending.
Being single is the perfect time to get to know yourself. Try to figure out why you want to cry every night, why you think that external validation equals internal solution, etc.
I'm sure trying to get to know another person while trying to figure yourself out still is a tough thing.
And hey, I probably don't know shit. All I know is how I felt when I was in your situation. I felt empty, I felt like crying, I thought "If I just had someone here to support me, it'd all be better". And to me, "someone" was a girlfriend. I rushed into relationships, and rushed out of them. What I needed was a friend, just someone to talk to. I needed someone to remind me when I am just being hard on myself, or that shit is going to work out, that my life isn't that bad.
I don't know, I kind of lost my way here. All I mean is it's easy to get stuck in your own head and think that every thought you have is set in stone. This was healthy for me. I stopped trying to find a girl I could be with, started focusing on friends and myself more. Then I met a girl, and 3 years later we got married. I really do believe that it's harder to find something when you're looking. Like losing your keys, and then finding them in your pocket.
I don't know man, this is the dumbest I've sounded in a while but I just feel bad for you and want you to get out of this rut. Get better soon.