I miss my dad. Any advice?

My dad and me never had a great relationship after my parents divorced but about last year we stopped seeing each other. He still messages me occasionally but I rarely reply to his messages, his contact isn't even saved in my phone.

I just dont know what can help me, I really miss the old sweet him he used to be and i know everyone misses someone but I never knew I could miss him for so long, I miss all our old moments, I've tried everything and every time I'm up late at night I just cry and cry and cry about how much I miss the old him. He's turned unto a very rude man now but he was very kind before and I miss it. I have tried arranging to see him multiple times but it never works out and I dint like the new him, he's rude and disrespectful. I just miss all the old memories, if anyone has any advice to try and stop missing somone/thinking about memories with someone I would really appreciate it :]