I met this guy through an online game, and we started following each other on Discord and Instagram. We've been playing together a lot over the past few weeks, but yesterday he suddenly seemed to lose interest. His replies became really dry and distant. Earlier today, I saw him online in one of the games we usually play, and he was playing with someone else. I felt hurt because he didn't invite me, even though he usually asks me to play with him. I also noticed that I'm no longer on his friends list. Is this a sign that I should stop talking to him and just block him?