What does this message mean "I love you even if you don't love me back"?

I woke up to a text notification from my ex-girlfriend. My heart skipped a beat when I saw it. We hadn’t spoken in almost four months; not since that messy breakup where we both said things we regretted. At first she had been distant, then angry, and I had tried to move on. Now I am dating someone, and everything had… well, worked out. We ended things badly. I was the one who had walked away, telling her I wasn’t happy anymore, that I didn’t feel the same way about her. I had told her I needed some space, and I had thought it was the right thing to do. I didn’t love her anymore, or at least I thought I didn’t. But that text. It brought it all back. I remembered the late-night talks, the laughter, the plans we had made for the future. I remembered how good we were together. We were both at fault, but I had been the one to give in. I thought about her words. I love you even if you don’t love me. What did she want? Closure? Validation? Or was she making me feel like she still cared despite everything? I knew I shouldn’t have any feelings for her anymore, but I did. I still cared, just not in the same way. I couldn’t deny it, there was a part of me that missed him. Not the fights, not the constant tension, but him, the one I fell in love with. But that wasn’t enough to make me come back. I had made my choice and I had to stick with it. I was in a new relationship and it was different. It felt like I could breathe again, like I wasn’t walking on eggshells all the time. I didn’t want to hurt him again, but I couldn’t lie either. I took a deep breath and typed my response, my fingers skimming the screen. I wanted to be gentle but honest. I’m sorry, but I don’t feel the same way anymore. It hurt to write, but it was real. I sent it, put my phone down, and sat in silence, feeling the weight of everything we were and everything we would never be again. How do you think I should act, any advice?

What does this message mean "I love you even if you don't love me back"?
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