I love this girl in my class for four years and over that time we became really good friends. I asked her out and she said I was a really nice guy but she likes this other guy even though she acted like the liked me plenty of times now she is in a healthy relationship with this guy and I still really love an care about her what should I do?

Well, there is only one thing you can really do. Let her go. There is a saying that says: "If you love something, let it go. If it comes back to you, its yours forever. If it doesn 't, then it was never meant to be". Good luck my friend.

Turn your attentions to other things, and other people.

Im kind of in the same situation but I'm in the position of the girl. She probably liked you, but was tired of waiting for you to make a move over the past four years. By then she thought it was to late. Tell her how you feel and or just become real close with her again if you arnt now. Show her what u mean to her, but if she still wants to be friends you have to respect her wishes. Good luck! Hope it works out :)