Well, ask him what he's doing on his 'off nights'. Is he working, partying w/the boys?
FWIW, I do think its unusual not to have some kind of daily contact with an SO as serious as you two sound. It doesn't have to be long, protracted conversations, but a quick phone call or email isn't off the mark.
Why did he divorce from his ex? Just curious if it was for a similar reason. Careful w/divorced ppl; make sure they have sorted their shit out before jumping into a serious relationship with them.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh