Can a guy change his mind and decide he wants a relationship with a girl?

Anonymous
If a guy wants to just date casually and talk to other women... can he change his mind about a girl and decide he wants to be in a relationship with her? Even after they slept together? Especially if she's nice to him and not pushy about anything? Do guys ever learn to appreciate a girl who has been nice, understanding, and caring? I wonder if it was an absolute mistake to offer him a place to live if he failed and lost everything in his school too. He went completely silent on me when I tried to reassure him that everything was going to be alright and if he did get kicked out... he's my friend and he'd have a place to stay and not go homeless.

I'm afraid I was to nice to him and I'm very hurt he'd rather talk to other women than me. I don't even pressure him. I've been kind. I've never fought with him or tried to add stress to him. I don't know what I did wrong nor why he just... doesn't appreciate me. When he went silent, I have not tried to recontact him. I figured I said my piece and I tried to be helpful and reassuring... I know he'll probably just forget about me. I just wish I didn't care so much or was so hopeful. If there is no hope that he'll ever come around please... let me down nicely. I'm already hurting.
Can a guy change his mind and decide he wants a relationship with a girl?
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