Am I a bad person? or is this part of life

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long story short, I have been with this girl for a year now. She cheated on me when we first got together but I stayed with her because I wasn't super attached and I didn't think it would hurt me later on (I was also just an 17 year old who wanted pu$$y). It was going good for a while, and I was in love with her but I was never sure if it was right. As time went on, we started fighting a lot and I started to miss the feels I used to have around her but they were gone. One night, I was hanging out with a good friend of mine and we decided to get high. We were sitting in her car and I felt the most tremendous feeling and tried to kiss her. It was a stupid idea. I immediately regretted it and told my girlfriend and after a couple of months we are okay again.

The weird part of all of this is that I cant stop thinking about my friend (we arent really friends anymore). We were really good friends, we had a lot in common, and that night when I looked into her eyes when I almost kissed her I had never felt more in love..

I don't know what do to