Should I contact him after 6 months of no contact?

A few months ago I started talking to this guy. He's really sweet, a gentleman, he's pretty much looks like my dream guy! He's really shy though, and would get really nervous around me. Anyways I started having family troubles and lost contact with him. And now I really regret it! I feel like I've wasted an opportunity! So I wanna know if it'd be weird if I messaged him (after 6 months of no contact) or just to let it go?

Also guys what would you be thinking if a girl you used to talk to randomly contacts you again?