<human>: I'm a 18 year old boy and was in a relationship for 1,5 years. The relationship started because she showed that she was really interested in me and I got interested in her too shortly after. We dated for a few weeks and we got into a relationship. 

She was a great and loving girl but she was also kind of childish and I was often annoyed by her. She also wanted me to block all connections with my previous girlfriend but because my previous girlfriend and I still have a good connection, (we seperated friendly) it was a bit hard but I sacrificed it for her. But one day I started dreaming about my previous girlfriend and the desire to talk to her and spent time with her grew.. So one day I was drunk and went to her home (nothing happened fortunately) and I fell asleep on her couch.. Of course I had to tell it to my girlfriend and she wanted to give me a second chance but I knew that would not work out because the trust is much likely gone so I ended the relationship. 

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Can you give me the gist of the text in a nutshell?
<bot>: ) Now my problem is that I was the one who wasn't loyal to her and I am really scared that I can never be loyal to anyone anymore or that no one will date me because I'm a cheater..