Why do men chase you until they get you, and then leave?

So this is a genuine question. I’ve only ever been in one relationship, and we split 4/5 years ago. I thought I loved him, until I met this new guy soon after. We started off as friends but there was this intense connection/ chemistry between us. It made me question if I ever even loved my ex. Just over a year ago we began sleeping together, we were best friends on top of this little side sexual thing we had going on. He was the best person, so nice, so polite, so gentle, so loving. Eventually the past few months I guess I have been going on at him more, asking to see him more, wanting to spend more time with him. He stayed around but avoided or changed the subject when I asked. He said he wasn’t ready for a full relationship but it already seemed pretty relationship like to me. Eventually I felt him pull away a little, he stopped texting every morning like he has for years, so I got angry and I double texted and rang over the span of a week. Eventually he phoned me and shouted like he’s never shouted before, he told me I wasn’t his girlfriend, and I’m an emotional wreck. It hurt so much, I didn’t think he could be so cruel. I told him I loved him and he put the phone down on me. I’ve never felt pain like it. I blocked him afterwards and thought it was best to leave him too it, but this recovery hurts more than the end of a 12 year relationship. He was my best friend, my go too, and he switched with no warning. I feel used and not good enough, I feel like I’ve been played and laughed at. I can’t eat or sleep, I can’t even imagine a life without him but I have too. Why do men treat woman this way. I have only ever been nice to him, fair enough it wasn’t set in stone, but I always spoke of feelings and love, and if he didn’t feel that way the decent thing would have been to of walked away. I always felt like he loved me, he just wasn’t ready to say it, I always felt like I was waiting for him to want me, I feel so stupid and so hurt.

Why do men chase you until they get you, and then leave?
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