Why was this guy hanging out with me when he has a girlfriend?

desperatelyhungry
We’ve known each other since we worked together about 5 years ago. We lost touch but reconnected recently. He now lives 3 hours away. Whenever he comes home we hangout, and I went out to where he lives for an unrelated reason and he invited me to the symphony with he and his friends and we all
Hung out together. I noticed his wallpaper was him and a girl, also from back home, he had talked about who was an old friend from
Hs. Here a few days ago we talked on the phone and got to talking about old relationships so I Straight up asked if they were Together and he said yes. I said I wouldn’t be ok with you hanging out with a girl alone if we were together and he said she knows it and is fine with it, and Also has male friends she hangs out with. I told him I’ve liked him and needed to know if there was a chance. He said he liked me and thought a while ago there was something there but i talked about liking a guy so he gave up. Why would be not mention being with this girl? We’ve texted a couple times since then but I’ve put in more effort and I know I need to stop talking to him since he has a girl. Was he playing me?
Why was this guy hanging out with me when he has a girlfriend?
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