how to move on from someone who lied to you

r/

(2 years fwb/relationship kinda?)
my brother had a childhood bsf (male) who is 3 years older than me since like first grade. they gradually grew apart and when I entered highschool, they were no longer friends. I started liking him. He forgot about my existence though.

However, he texted me on my bday and later found out that I was his childhood bsfs sister. We continued talking and I confessed my feelings to him 6 months later. He told me he liked me too but didnt want to date as he wanted to focus on his future. I told him I’d wait and we started meeting offline. He kissed me and then we gradually started making out, still w no labels and no one knowing about this because he didn’t want k tell anyone before we started dating. We had agreed to date after his exams end which were a year away. However he started becoming friends with two girls of his own age. He used to hang out w them and I did not like it. He told me that he would never date them and i js decided to go along w it. When his exams finally ended and i thought we would date, he now told me that he wanted to focus on his career. I js went along w it because I did not want to end whatever was going on.

He also told me he loved me and i didn’t tell it to him back because none of his actions showed that he loved me. He told me he started loosing interest after i didn’t tell it back and I get that, but he used to text other girls and not tell it to me and still had the audacity to tell me he loves me.

As another year passed by, we would still meet and make out but contact each other lesser. I grew close w a guy who liked me but we were genuinely close friends and classmates and he didn’t like that. I knew this was bad on my part but if he did it w his friends, why shouldnt i?

However, we stopped texting each other and used to fight a lot to the point he didn’t even wish me on my birthday. I was very hurt. We finally met and he told me he wanted to end things and that I hurt him too much. I begged him to change his mind but he told me he couldn’t do it anymore and that he won’t date anyone else (not like he dated me in the first place)

Two months later, he is dating the girl bsf he told me he would never date and he is OFFICIALLY dating her publicly which he never did with me. I was insanely hurt because I still felt like shit. And the worst part is, she doesn’t even know that he was w anyone js two months back and she doesn’t know I exist at all.

It’s been around 4-5 months since I found out they were dating and though I sent a very grateful message to him when I found out and then blocked him, we have never talked again after that but i still think about him everyday. How do I move on?

TL;DR : secretly meeting up w a guy for two years who tells me he doesn’t want to date anyone, he tells me he loves me and I don’t say it back (even though I do), leaves me for a girl he told me not to worry about. How do I move on?