I like a guy but he has many red flags, keep going or let it go?

I like a guy and he had a weird behaviour, he kept throwing another girl in my face when i told him that i like him. i dig deeper and understood that he has not yet moved on from his first relationship since 2 years while his ex has already moved on. He still puts her on a pedestal. Also he lies with his parents and family that the girl and him are still together. When i pointed these things out he went on and erased everything on his account. I made him understand that he needs to move on and that i won't be his rebound and will wait for him to heal. I even sent him videos on letting go and all. When i said that he went back and added the girl in the description of his profile. I feel mentally drained since then and told him we will talk in 3 months. i met him 4 months ago at the temple and i don't know why we met but i really want him to move on from his first love so that he does not suffer.
Also since i pointed out everything, he only reads my messages but don't reply.
do you think i should keep doing what i am doing or let it go now?
I like a guy but he has many red flags, keep going or let it go?
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