Sorry for your loss. It sounds like you had a very close relationship with him that must make it really hard.

I lost my dad 7 years ago last month, and it's been the hardest thing in my life. If it's any consolation for you, you will never stop missing him. This Reddit post really helped me during the really hard times https://www.reddit.com/r/GriefSupport/comments/d9685e/grief_...