Why do my friends go from valuing me to treating me like garbage when I get a girlfriend?

I'm a self admitted sad loser. I'm hard on myself, I'm not confident, I let my mental state and physical state take over. I have had one girlfriend in my life. None of my friends have had significant others. They got jealous of me. They called me a psycho, and a creep. They said I'm toxic and acted like my girlfriend and I were my fucking property and I treated her like that. I never did so, I loved her and I'd do anything to keep her safe. my friends found out I had a girlfriend, and one time and while I was hanging out with them I proactively told my girlfriend to go home, and my friends thought I was forcing her to go home. it was a bad misunderstanding. <br><br>After that, they said I was a woman beater. they called me a creep and a loser, they said I was using her and manipulating her and taking advantage of and abusing her. I wasn't. I loved her.<br><br>I'm not going for a pity party here, I just really don't understand why my friends turn on me when I get a girlfriend. it happened and while we were together, they were nice to me, but when they found out and while I was still with her, they treated me like garbage. It's been years and they still treat me like absolute garbage and trash. I just want to know why they turned on me like that. I feel so alone sometimes, and I thought they cared about me but they don't.