How to get a girlfriend

Long story short I dated a guy for 2 1/2 years. We met as freshman in college and broke up our senior year. We had a trouble relationship and despite that I treated him very well and loved him despite how bad I had been treated. I didn’t want the break up but know it’s for the best. I want someone who treats me a lot better than I’ve been treated. My ex and I still talk and hang out several times a week. We have no intentions of getting back together but he says he doesnt want me to not be in his life. He’s never dated anyone else so he wants to be sure about the future.
I still love him with all my heart. He means the world to me and I love him so much. I know I deserve a lot better and I know in my head we can’t be together. THat doesn’t help how strongly I feel about him though. I just found out he is kind of seeing someone. He doesn’t know I know and I don’t know if it’s my place to ask. Regardless I am so upset and hurt even though I know this step is what both of us need to do. I don’t know why I still feel liek this, what to think of him, or what to do/say. Advice?

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