Can a guy really stop caring so quick?

Me and my ex broke up like 3weeks ago. Before the breakup he was mad at my friend Because my friend was telling people he was gay. I was the one who told my ex first so I could calm him down so if he heard it anywhere else he wouldn't beat up my friend. However my ex thought I was starting drama which wasn't true. So he ignored me for a day or 2 and I went crazy I hate when he does that.ter we argue he stops being all over me. so I had enough I text him blew up on him and told him he need to stop doing that that I'm done trying but I'm still his girl. I said way more then that but he was mad. I guess I hurt his feeling Because he broke up with me. After that we chilled he was back to the I'm his everything rant. I really thought the kid loved me. His sis and mom would tell me he does. His family seemed to love me. We had it good despite all the arguing. He always always always would text me. He took me to this spot where it had a beautiful view. It was freezing and he was cold but I wanted to look. And he stood out there with me held me and we had a deep convo. If he did care why would he have thought of bringing an extra coat for mem then we went out to eat the next day he notice I was mad at him .if he didn't care he wouldn't notice. He notices the little things about me like when I get a trim or if I was crying. He took care of me when I had extreme stomach pains. Last we he started saying he doesn't care anymore is it because I blew up on him? I asked him but he said he just gets so mad that he lies to hurt my feelings as much as I hurt his. But yesterday he wouldn't even call me when I asked its over omfg its really over. Help! Explain why guys can stop caring so much.
Can a guy really stop caring so quick?
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