Relationships

Do I still have a chance with my ex even if I had sex with his cousin and drunk called him even though he has a girlfriend?

our love connection was so strong so I think that's why we lasted so long but I dated this guy for a year. He said I was his first love and we had a great relationship. The only thing was that throughout the relationship he thought I was embarrassed to be seen with him. Truth is.. I was because i had extreme social anxiety and didn’t want people talking (immature of me) I would always deny it but he knew something was up. i would never post pictures with him to or old hands in public. Also he wanted to break things off because he felt like he wasn’t making me happy anymore apparently but I really think it was because of my immaturity and I hurt him so bad. i would hang with other guys and had so many guys (with friends around) and have lots on snapchat too. I also didn’t even go to his birthday party because I was really worried that he was loosing feelings for me. I felt so bad afterwards. Anyway after we broke up we started snapping a lot and he was flirting a little bit until I THINK I messed things up after I drunk texted him. Then a few months later he got a girlfriend and drunk called him. all I said though was my friend needs help because she was drunk but its still so embarrassing. then I drunk texted him and said that I was jealous that he has a new girlfriend but I did it in like a playful way. But then he sent a picture of him and his girl cuddling. then I fucked his cousin because I thought it wouldn’t even be a big deal but now I regret it. but I want him back do you think there's a chance that I could? I was so immature at the time and now I've grown so much. I believe it was right person wrong time

Do I still have a chance with my ex even if I had sex with his cousin and drunk called him even though he has a girlfriend?
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