Relationships

How do I deal with falling in love with the wrong person when already in a relationship?

I am in a 5 year relationship, and the girl I am with is everything I wished. If you would have asked me what qualities a girlfriend should have, she meets most of them. She cares, she is there for me, she wants to help me build a future with me, I respect her a lot, I would do anything for her. However, one year ago I found myself falling in love with a girl I barely know. We met though some common friends, and we've seen each other about three times. We never dated, and I am sure she is not interested because I actually tried to go out with her to know her better and she rejected me. She is the total opposite anyone would wish. She slept with loads of men, she is very materialistic, she kept telling stories about how much money men would spend to spend time with her and what kind of expensive gifts she receives. She's not the type that would actually be there to build something with you, she only seems to demand, maybe because she knows loads of guys are interested in her. I thought my feelings will be something temporary and I tried to get over it, in the end, she is the absolute opposite of my type of partner. However one year passed, and I find myself thinking about her, thinking about how's she doing and craving to see her. I don't contact her because I feel it's wrong, but every now and then we bump into each other. Everytime I see her makes me feel horrible, depressed and anxious. It just fills my mind, my thoughts, everything. I can't do anything else properly for hours, I can't pay attention to anything, all I have in my mind is her. I am writing this because it just happened again, and I am now sitting in my car in the middle of the night and I feel like I have nowhere to go. Please don't judge me, I need help, I don't know how to deal with it anymore.

How do I deal with falling in love with the wrong person when already in a relationship?
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