I broke up with my girlfriend of +-5 years 2 days ago because

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I broke up with my girlfriend of +-5 years 2 days ago because things weren't working out, and now I do not know if this will be the biggest mistake of my life.

We got basically got into an argument and she didn't seem to understand me (this happens most of the time we argue) and mentioned I let these arguments always go the same way and I do not seem to change or adapt to her. She keeps it really vague and almost exclusively uses the argument that ""this"" always happens whenever we get into an argument. I say that I really try to do better, listen better, see things from her POV, but she does not feel that way (she doesn't even notice) and will never give examples or something "explicit" for me to work with (this seems weird to me as she is studying psychology).

She isn't too funny so when we're spending time together, the fun has to come from me. This was never a big deal for me, until she said that all I do is take and the only thing she does is give. That kinda bothered me and it felt kinda heartless, but whatever.

Now, she was my last friend I had and ring of friends has essentially dropped to 0. I feel alone and unhappy. I'm not really great at making new friends. What do I do /adv/? I still love her but fear that our relationship will ultimately circle back to one of these arguments and that will make me probably feel even worse...