SUBREDDIT: r/tifu
TITLE: TIFU by being a heartless bastard.
POST: This series of events started last night around 11:45, and ended about an hour ago.

So last night, I got a text from my ex-girlfriend saying that she wanted to hang out. Me, thinking that it would be a good idea to do this, agreed to go meet her (mistake #1).

After driving to her place, we proceeded to have a few drinks (mistake #2), during which I find out that she broke up with her boyfriend THAT day. I tried to console her, and because I'm a fucking moron, slept with her.

This morning, after another round of doing the deed, I told her that I had to go and say goodbye to my stepdad back at home (he had asked for me to say goodbye before he went on a trip and I went back across the state where I spend most of my time). 

My Ex, being in a very emotional and fragile state (which I failed to recognize, because I'm a complete dumbass), proceeded to burst into tears and kick me out, saying that all the men in her life always just use her then walk out on her. I tried to apologize and explain things to her, but she was very adamant that I was using her and didn't want to hear it.

After driving home, and thinking about her reaction the entire 45 minute drive home, I see where she is coming from and feel immensely horrible. Like, to the point where I know feel literally sick from my own actions (alcohol in my system notwithstanding). I sent her a very long text apologizing, and I promised her that I'd make it up to her, which is a promise I fully intend on keeping because I really feel terrible about the entire situation. I'm not feeling optimistic about the situation at all, and have yet to hear back from her (although I don't expect an immediate response).
TL;DR: 
Slept with ex, made her feel like she was being used only for sex, and left because of a fairly BS reason.