No, don't leave! D:
As said before, people may not post on your threads. I felt quite discouraged from drawing when no one posted on my thread, but it's what I love doing, and the amount of replies on a post doesn't really matter. I'm really bad at complimenting things, and just talking to other people in general, so I don't post on art threads and stuff all too often.
If you feel left out of conversations, then just keep trying to talk to the other people and bring up new topics. Or maybe you shouldn't listen to a person who as I said before, is really bad at talking to people. xD If they're really leaving you out and not talking to you at all, heck, just stop talking to them and find someone else to talk to that will actually listen and respond to you.
Although I don't know what happened, if whoever you were talking about didn't forgive you and won't forgive you, they're not worth talking to if they can't accept an apology for a mistake.
And er, I've never really heard of Henry Allen. But just because no one responded doesn't mean that no one cares, and that goes for the threads with your stories and art.
I can't really stop you if you decide to leave, but I do hope that you at least think about what the others above me and myself have said.