Do girls like to play with your emotions?ASAP help plz?

I have been talking to this girl in my college I help her I don't lots of favors for her I'm crAzy about her I will text her saying Funny jokes and she bearly replies. As if like she is pissed at some thing and she puts a ! Mark after every time she texts me? Wat should I do ask her out on a date? Tell her how I feel? Or buy her a rose and ask on a date? Or just leave the girl alone for now? And get in touch with her over the summer ? Or should I just move on bec I can't. I think she might be testing me or something . Why do girls take long time to text? Or never even reply back? Wat should I do? How do I get her to like me ? How should I trap her in my lov