This girl(18) who I(M18) consider one of my best friends and I have been romantically talking for a while, we also hooked up a few times.

She told me that for a couple months she was obsessed with me and she also had normal feelings for a while. About a week ago they suddenly disappeared. She also mentioned they might come back suddenly, she doesn't know for sure. I really wanna spend time with her but she cancels plans a lot by saying she doesn't really feel like hanging out, which I try to be understanding of. Even though she says she doesn't have feelings for me anymore she still wants to hook up occasionally.

I worry a lot I'm too clingy when texting her or asking her to hang out and I'm worried I'm pushing her away, so I don't know how to act around her anymore. I'm scared that if I text her she would get upset with me since I don't wanna make anything difficult for her, which leaves me feeling like shit a lot of the time too. 

Is there anything I could do or should know to be more understanding? This whole situation has been really been messing me up for the past 1-2 weeks.