Best friend led me on and now I found out he has a girlfriend. What should I do?

My best friend knows how I feel about him and he made it clear that we could not date since he doesn’t do long distance relationships. (He lives in FL and I live in MA.) I told him that I understood and we could just be friends, but to please tell me when he starts dating out of respect for me and my feelings. He agreed. Well, a few months after we had this conversation, he mentioned that he wanted to move. He kept hinting that he was going to move near me and we could try our hand at a relationship. I was excited and looking forward to having him near me regardless of what we became. He led me on for many months and then randomly told me that he sold his house and bought a place in WA. I was shocked that he did that and a bit hurt, but being a good friend, I told him that if he was happy I was happy. I pretty much wrote off any relationship between us because of the distance issue yet again. But then, he told me not to worry and that we would figure it out. He led me to believe that someday, we would be able to live together and start a relationship. So then two weeks ago he told me that he had a showing of his art at a gallery and wanted to invite me to go see it. I couldn’t go due to my busy work schedule, but I told him that I was proud of him and that I looked forward to seeing pictures from the event. So tonight, he sends me some pictures and a few screenshots of his Facebook page where he posted it and on one of them, he accidentally sent a picture of him kissing some woman. The comments were all talking about how beautiful his girlfriend was and one said they can’t believe that they have been together already nine months!! I was heartbroken, because he had led me on for months pretending that we could be together and that he was moving near me. Also, had I gone to the event, I would have been blindsided by his new girlfriend. I was upset that he didn’t respect me enough to tell me that he was seeing someone. Now I don’t know what to do or say. Please help!

Best friend led me on and now I found out he has a girlfriend. What should I do?
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