Why would a guy all of a sudden have a girlfriend of 10 years?

fleet

I have this guy friend from work that has been flirting with me non stop for almost a year now suddenly tell me he has a girlfriend of 10 years. We are currently friends so he does know I go out with other guys and I see it bothers him but he hasn’t done anything about it. Then he tells me he has a girlfriend which I think is a lie. We talk on the phone for hours almost everyday and he has never mentioned her. We have never actually went out but he does stop by to hangout and I see him everyday at work. He messages me that he misses me and “wavs” all the time. He also says to me guys and girls can’t be friends. I told him let’s keep it from here out work related and he still flirts etc. I pretty sure he’s lying but why

Why would a guy all of a sudden have a girlfriend of 10 years?
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