She's 15 years older, took my virginity... did she use me?

So i work with a non profit group, i met this girl through that. She seemed to be into me and i was told by a mutual friend that i should go after it. We eventually started hanging out and i could tell she really liked me. I kissed her one night and she was so excited by it. I did it right before she went out of town for 5 weeks to go to school. We sexted the whole time she was gone. When she came back home we started hanging out and making out all the time, she was all over me. I was a virgin and told her so, i wasn't sure if shed be okay with taking my virginity. She said it was very sweet and she saw it as an "Honor". We started having sex and everything was great. For a while. Im not sure if i got clingy or something else happened but all of a sudden she just wanted to be completely different and said we could only be friends for now. I was torn by this and acted super clingy then just left it alone for a while. We tried being friends with benefits. But then she didn't want to do that either... Another thing is she fell for the guy who runs the non profit we work with he didn't have feelings for her and she got out of it with him a few months prior to us getting to know each other... she broke it off with me a few days after he became single again. Its really tough on my now because i dont know what to do, i want to be with her and have sex with her, and dont want to get stuck in a "friend zone" situation. No contact is difficult because we basically work together and have so many mutual friends.

Was i just a rebound for an older woman? She said she really did have feelings for me, she even told her family about me (Which i thought was kinfdof weird with 15 years apart and all). But that she felt the pressure was too much. There is a lot going on in her life but its just so hard for me to figure out how someone turns off feeling like a light switch.

Should i try to stay in touch with her to see if things change?

How do i at least get her back in bed?
She's 15 years older, took my virginity... did she use me?
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