Did I take this too personally?

So I was friends with this girl last year. We were super close and got along really well. After a while I started to think that we could have a future together and I really liked her. She even called me cute a few times and said some other things that you would only say to someone you are attracted to. However, she was already involved with another guy who she knew even before meeting me. To make a long story short, I tried to make a move and she said she liked the other guy and did not feel the same way. This is the part where I knew I messed up. I took that personally, like it was an indictment on me as a person or something was wrong with me, and one night after some drinks I said some things that I shouldn't have about this guy (he wasn't there for it). Anyway, that same night I actually made a move on her and we kissed for a couple of minutes. The next day, she was super upset and said she did not want to be friends anymore and that I didn't accept her decision. My question is, whether I was right or wrong to keep trying, why did she voluntarily kiss me that night then? Was she still attracted to me but just really liked the other guy still? And then why cut off our friendship like that? Again, I know I made a mistake and I regret it a lot, but this whole thing confuses me a little bit.

Did I take this too personally?
Post Opinion