Why did he change his mind so quickly?

julia5991
I met this guy on Tinder. We started texting over the summer, but I ended up not responding because I was super busy. In August, he added me on Snapchat to get my attention (after I didn't respond to his double text). I didn't even know who he was at first because we hadn't talked much so I didn't recognize him from his Snapchat pictures. But after talking more I realized he was from Tinder.
We made plans to hang out and I made the mistake of hooking up with him on the first "date." Which was just Netflix and chill and a bottle of tequila, planned by both of us because neither of us felt like going out that night. Anyway, yes I hooked up with him on the first date. I wasn't looking for anything and from the way we had been talking it seemed like he wasn't either.
Oddly enough, after hooking up, he wanted to take me on a real date. Our second date was him taking me to an extremely fancy restaurant and buying me a steak dinner. After that, it was a whirlwind. He was good looking, smart, funny, charming, and we had the same goals in life. He told me he was so into me and could see us being together for a while. Something happened, though, a miscommunication between us due to things moving too fast and we stopped talking.
Long story short, we've been on and off since August. I realized he is all words and no action, well, very little action. He did so much for me in the beginning and when we started talking again, he was acting very differently. Just a week ago we decided to take our relationship to the next level, and he told me the same things as before. That he wanted to be with me etc. But his behavior was different. He wasn't as eager to see me and not texting me as much. Anyway, he ended up dumping me because I got mad at him for ignoring me for 12+ hours when we had plans. Why do men go from wanting everything with you to nothing? I'm extremely heartbroken because I was legitimately ready for a future with him.
Why did he change his mind so quickly?
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