I'm internally torn and don't know what to do! Please help?

One of my best friends(who happens to be a guy) and I hang out a lot, and I can tell he likes me, but he's never said it. Anyway, I have a boyfriend who I really like and he knows it, so we are only friends and he never seems to mind. My other friends, him, and I mostly talk about dirty jokes and most of our conversations are ual, sometimes jokingly towards each other. He just started hanging out with this girl that he met today, and he ditched us at lunch to go sit with her, and by the way she looked at me I could tell she didn't like me, as she likes my friend and probably thinks he likes me or I like him, and is jealous. While at lunch, he was originally sitting with us, his real friends, when she told him to come sit with her. When he came back 10 minutes later, she dragged him back again. He looks like he might like her, but I am almost sure he's doing this to try and make me jealous. Problem is, it's working. But I have a boyfriend who I'm in love with! Do you think I actually have feelings for my friend? Or am I just mad at the girl for taking away a good friend? Don't ask me, I can't tell. Romantic and Platonic feelings get mushed up together inside me when stuff like this happens. I honestly can't tell. I'm really confused!