Ryan, Leslie -- TY for being honest. These are other reasons I might leave seemingly abruptly.

I've also been in this situation at least twice: I'd just been in a conversation with someone who was needy. Given that I come here because I have needs of my own, that I set aside for a while, I was wrung out at the end, and had stayed online longer than I intended. I was the last person to leave the room, and before I did, someone new comes popping in. I didn't leave without a word, but I had a sense that the person who'd entered thought I was leaving "because of them" at least in one of those instances. I was sorry that I couldn't offer more reassurance -- but it was time for me to take care of me.