After 8 months, my ex contacted me again

Im in an emotional chaos right now. After a two years plus half a year on-off relationship with a woman I loved more that any other girlfriend Ive had, we broke up. It took a toll on me, and after 8 months of no contact, she texted me and said she wanted to meet. Initially I said yes, but cancelled the day before, because I couldnt see the point with it. It felt so right. She texted me and insistered that we should talk, and I ended up calling her, thinking how cold do I wanna be towards her.

The good talk we had on the phone made me want to meet her, and so we did. We had a good talk about our reflections about the past, and had sex. After the sex, the atmosphere turned somewhat distant between us. She left, and I somewhat got angry, because I still have feelings for her. I called her with this anger and told her that I think she is alting selfish (which I truly believe she is in many aspects) by ruining my healing process, even though I know Im fully responsible for saying yes to meet her. She got mad back and the atmosphere got hostile, and we hung up.

I have this feeling of something being unresolved, and Im mad at myself for talking to her like that, and for meeting up and hooking up with her. I dont feel I stood by myself as I usually do and intented to do here as well.

Do you know the feeling, and do you have any advice to how I should handle this? Should I call her to get a better closure or learn to accept it?

Thank you guys

EDIT: Guys I know I fucked up, and where I did. I wrote this post to hear about your experiences, where you lost composure, and how you dealt with it in a healthy way, without hating yourselves for the things you wish you would have done differently.