I broke up with my ex last November. So more than a year ago. When we were together he massively lacked effort. He didn't take me on dates unless they were to free places and in the whole time we were together he only stayed at my house once despite me asking him numerous times. It was always me that had to make the effort to go and stay at his and in the morning after he would always be doing something early so I'd have to leave. His ex, the mother of his child, constantly texted and called too in mallicious way so to get in the way of our time together, so we got no time alone without interruptions.
Now he's met a new girlfriend and it's really thrown me. I am over him but still i feel really sad. I feel sad that he makes an effort to go and stay at hers loads and generally seems spends a lot of time with her. I feel it's really unfair and I want to hit out at him for the way he treated me and the lack of effort. Aibu?