I hope one day you will realize I did truly care for you. I promise you're gonna miss me being there, putting up with you, refusing to give up on you. but you'll miss me when I become priceless to another. (Please read the entire quote.
When people make you feel unwanted, don't leave to make them feel sad or guilty, they won't. Leave because you no longer have a reason to stay. Sometimes you have to be strong for yourself. What's meant to be will end up good and what's not - won't.