<human>: Can you give me the gist of the text in a nutshell?

I recently got back to my campus and today was the first day of classes. I got high with a female friend of mine that I met over a study abroad and we were walking around campus. I see my ex-girlfriend that I haven't talked to in over a year (habitually, not out of spite), and decided that I should try to be nice and friendly, so as not to seem like a douche. I kind of come off as cold and reserved to some people, and I was under the impression that I came off as an asshole to her particularly. I say hello to her, and we make small talk about our respective summers. 

I was feeling super uncomfortable by this conversation, both because of the context and the fact that my friend was waiting silently. My ex brings up my study abroad in East Africa, and asks me about how it was. Nervous and high, I introduce my friend to her saying that she went along with me, so as to get her to join the conversation. 

I had a pretty bad gut feeling about this conversation, and realized that in retrospect, it looked like the only reason why I started talking to this girl after one year of us not talking was to introduce her to a girlfriend. It probably made me look desperate and douchey, and I fucked up my chance to be on good terms with someone.
<bot>: TIFU by looking like a douchebag while trying not to seem like a douchebag to someone I cut off contact with.