What is happening?

So, I’ve been in a serious relationship for three months now. However, there was a guy I used to like and as soon as I started dating my current boyfriend he told me he liked me and that he wanted to kiss me. Of course I didn’t let him. But this guy has been my really close friend, I couldn’t just cut him off. He is now currently dating someone as well. However, I find myself thinking about him all the time. And wanting to kiss him. I’m really confused because I love my boyfriend, I don't know I just need a logical explanation for my feelings I guess.
What is happening?
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