I’m so Obsessive Over what he Thinks

I’ve been in love with my male best friend for a while now. We dated for about a year in 2019. Then things ended and he got another girlfriend. We were still best friends and still very close. But I never got over him and I’m still not. I obsess over what he thinks of me. He knows I still have feelings for him, but I’m sure he’s over me as far as romance. I get mixed signals. He’s bipolar so his mood changes pretty constantly. And I always take it as though I myself have done something wrong. Currently, he’ll reassure me that he’s not dating a girl that he mentions off-hand. He’s not at all over his most recent ex. They had a fantastic relationship. We all got along. He was super happy, etc. and I was happy for him! He’s on dating sites but has yet to find anyone that he’s actually interested in. I don’t know. I don’t even know how to explain it. I’m sorry if this was so jumbled. He knows my feelings for him. He knows that I still love him. And I just keep getting mixed signals. He’s not doing it intentionally. I just think he may be going though the ups and downs of a break up and doesn’t really know where he’s at really. What do you guys think? And please, above ANYTHING, what can I do to stop obsessing over him??? I don’t blow his phone up. I give him plenty of space. I wait for him to come to me when he wants to talk.