Old girlfriend. Don't understand if she still has feelings for me. Girls, what do you think?

We broke up back in high school which was roughly 5 years ago. We've been in and out of touch since and have hung out a few times. She's been with another guy for a while now and they're currently engaged, but here's what I don't understand. About a year ago we started going to clubs in groups and she'd always get upset if I didn't watch her do karaoke. She'd literally start a senseless bickering match with me. A few months ago I went to visit her cousin out of town who is a friend of mine and she coincidentally showed up. Everyone thought it was suspicious. Her cousin tried to get me to make moves on her. I never did and after I left she got into an argument with her cousin over it. Apparently she overheard us. She said she hadn't had feelings for me in a long time. We haven't been in touch much since then, but she just sent me an e-mail with links to dance cl seminars. I told her a week ago I'm interested in dance cles. She said, "It made her think of me."