Why do I still love her?

Hi. So I dated my ex last year, we both fell in love and had stated how much we cared for eachother. Even to the point where we discussed a future.

She had some issues with depression, something I'd never came across before, but I tried to help. Eventually things overwhelmed me, one thing lead to another and we broke up.after the breakup she told me she'd also been suffering with an opiate addiction, and had used it as an escape. She tried to make me hate her and even overdosed at one point. But I managed to help her through that night. She said after she had to get clean but couldn't talk about relationships at the minute due to this.

we kept in touch off and on, she would tell me she missed me and even at one point said she still loved me but stood firm about meeting up and chatting about the relationship. I still had hope though until she broke it to me that she'd been seeing someone, and in her words, had been for a little while.

This crushed me. It felt like the breakup all over again. She blocked me on her phone and fb so we haven't had contact since. I still love her though even though I should hate her and should want to move on. I don't know if she was conflicted about her feelings for me, if this is a rebound relationship or she is truly over me. I can't sit and wait for her even though I really want her back. Don't know what to do