<human>: Summarize the given text in a few sentences.

I admittedly have a crush on him and have for the majority of the time we've known each other. Earlier this year we were very close with him coming over and cuddling for several weeks. I'm fairly certain he has been flirting with me lately as well. I recently found out he has had an off and on 'friends-with-benefits' relationship for the past year or so, with a different friend of mine. It was to the point where some nights he would leave my house after cuddling for hours and then go to her house and sleep with her.

We are close friends, but I don't know how much of the flirting I am making up in my head and how much is him just being oblivious to the fact that I still had feelings for him. Additionally, we only found out about him doing this because he has gotten himself a girlfriend. He didn't tell either of us (me nor the girl he was sleeping with) that it was happening until it was on Facebook. He slept with his "fwb" one day, sent very flirty texts to me the next day, and began dating this new girl the next.
<bot>: The guy friend who has maybe been flirting with me has been sleeping with my other friend and not telling me.