I feel like I lost, and now I avoid trying completely.

I had something really nice with a girl I really liked. She was someone I knew for long before having something with her. She knew a lot about me, and I can say confidently I never liked anyone as much before. Unfortunately things did not end well. She played me, and I was just the rebound until she went back to her ex. I got made fun of by her and her friends, something which I never thought she would do. She tried to pity me and pull the “let’s still be friends” on me. This only made me feel bitter and spend most of my time trying to improve, but not for me. I felt like I lost, and that now I had something to prove, to win. Fortunately the thought of her has faded from my mind much more, and now that is not my main focus. However I still feel like I am not over it. Maybe it wasn’t that deep, but to me it was. Now I avoid women at all costs. I could even say I am terrified of trying again. Putting my trust in someone or even trying to meet someone feels pointless. I have no energy or desire to meet anyone, and I just wanna avoid ever putting my trust into someone again. It has now been some time since things ended, but I still haven’t moved on. What would someone in my situation do?