Does "loving deeply" someone really exists?

Or is just a attachment issue of lonely people?

Sometimes I feel like I just can't move on from someone that I like, even though that person doesn't even care about me anymore.

I still remember people I liked 12 years ago, and even though the girl maybe just liked me for some months I still remember her, even if is not romantically anymore.

That's my weak point. I feel terrible about liking people, I feel like those girls have power over me just because I remember then, while they probably hate me or laugh at me or even don't remember me at all.

I feel bitter about it, but I can't help but feel attached.

I feel like I would be an evil person if I denied my heart to remember that I liked then, even if that makes me weaker than they are.

Most girls I've met seem pretty good at moving on. This girl years ago apparently liked me, then she find another guy and blocked me out of existence at the point she didn't even look straight at my face at the social place that we literally joined together and blocked me out of all her social media even though I had some friends in common.

How do I not feel bitter after this? People just run in and out of infatuation with you, and then just treat you like nothing after they move on.

Or maybe they are right? I'm a crying fool that cares too much about people and worries to much about offending them?

I feel like I should treat people like stuff too, maybe my empathy is just moral grandstanding? Everyone is supposed to manipulate and being impersonal even with people they liked?

Should I hate them back? Not care about them anymore? They don't care about me right, so why I should give anything to them?

Or is just a attachment issue of lonely people?

Sometimes I feel like I just can't move on from someone that I like, even though that person doesn't even care about me anymore.

I still remember people I liked 12 years ago, and even though the girl maybe just liked me for some months I still remember her, even if is not romantically anymore.

That's my weak point. I feel terrible about liking people, I feel like those girls have power over me just because I remember then, while they probably hate me or laugh at me or even don't remember me at all.

I feel bitter about it, but I can't help but feel attached.

I feel like I would be an evil person if I denied my heart to remember that I liked then, even if that makes me weaker than they are.

Most girls I've met seem pretty good at moving on. This girl years ago apparently liked me, then she find another guy and blocked me out of existence at the point she didn't even look straight at my face at the social place that we literally joined together and blocked me out of all her social media even though I had some friends in common.

How do I not feel bitter after this? People just run in and out of infatuation with you, and then just treat you like nothing after they move on.

Or maybe they are right? I'm a crying fool that cares too much about people and worries to much about offending them?

I feel like I should treat people like stuff too, maybe my empathy is just moral grandstanding? Everyone is supposed to manipulate and being impersonal even with people they liked?

Should I hate them back? Not care about them anymore? They don't care about me right, so why I should give anything to them?