Gemini ex

I'm a sagittarius woman (Dec.14) and I had known my Gemini ex for a few years before he re-emerged in our group of friends. All of us started hanging out often and during this time, my ex and I started getting closer. Interest and flirting escalated to us eventually becoming a couple. Almost immediately, I noticed things about him that pissed me off. For instance, no self respecting guy who respects his gf would openly talk about f*cking another woman, would he? But that's what he did at dinner in front of our friends. His mood would shift frequently to where I wouldn't know how to approach him. He would be cool, then turn cold and distant. I'd try to get him to talk and laugh only to be met with snide comments and biting sarcasm. The insolence became too much and I learned slowly (because I'm annoyingly forgiving) that he just wasn't for me. I'm not dating one of those a*sh*les again. Too flaky and disrespectful!