He hasn't told me he has a girlfriend yet?

I met this guy.. he found me on fb, added me, we started talking, texting... all the time.. He is my brothers friend and my brother told me he has a girlfriend... but he hasn't told me.. he's on my brothers baseball team and I go to the games.. he tells me he can't wait to go to see me.. and I distract him from everything else when he sees me.. always texts me.. but I KNOW he has a girlfriend and I think they've been dating for a few years... I'm guessing I'm just an idiot for thinking I have a chance with him?
He hasn't told me he has a girlfriend yet?
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