Talking to me while he has a girlfriend?

I have ever talked about this guy.
We text and snap almost everyday for months. He says he wants to see me, asked me for pictures, always wants me, etc. We know each other pretty well. He asked me by his own (in general it was me who asked to meet) « When we see each other? », and then said we should meet when he comes back (he is with his family in another city) that is to say tonight or tomorrow. I didn’t see him for a year. I was REALLY excited to see him and to restart something.
And this morning, I wake up and check his instagram and see that he changed his profile picture by a girl, and that this same girl has wrote some comments under many pictures of him, with hearts and « sweet » words
This girl also have him in profile picture and he commented two pictures of her. All of that happened during this night. It seems crazy, I think they never see each other, she lives really far away and is a friend of his ex girlfriend.
Why he talks to me since all these months, asked me to meet if he begins a new relationship the same night?
Talking to me while he has a girlfriend?
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