For some background: My grandparents (dads parents) have raised me since I was 3 months old. They adopted me when I was 12. I have always had a good relationship with my dad but most of the time he seemed more like a brother than a father. (Doesn't quite describe our relationship, but that's the easiest way I can get it across here.)
Pretty much everyone we have told about our engagement is excited, they all love FI, but my dad just seems really weird about it. He honestly sounded a bit upset when I told him. When he saw us in person, there were no congratulations, or excitement, and I'm a little hurt by his actions. This is also the first time I've ever seen him try to act like a dad to me really.
What would you do? Would you try to talk to him and find out what's going on, or just let it go and see what happens?