<human>: I'm 19 and a girl, He's 20 and one dumb boy. We dated on and off for 2 years and are currently trying to be friends. We've known each other for about 3 years. Anyway,I don't get it. He even admits to it ( what im talking about in the title). I was his first actual girlfriend and we we're each others first everything. yet close to when the relationship ended he chased a girl who called him fat and never responded to him and he would buy her flowers and gifts and care for her more than me. Hell he chased me for 7 months before i agreed to go out with him. I've always felt bad that his past girlfriends treated him like crap and now he can;t get one  because he chases a new shitty girl every month. he'll realize its dumb for a week then just relapse. I do still love him and trying to be his friend right now, but its pissing me off.

Give me the gist of the text in a nutshell
<bot>: What advice can I give him to stop expecting shitty people to not be shitty? Why is he like this. someone please explain?