im sure he will understand that u just wanted to wait out a bit of u two living together to make sure it would still work while in the same house hold. i know living together before marriage is supposed to be a sin but i dont see how people do it otherwise because u should know each others...
yeah it is gonna be a little hard on her until she gets adjusted to your size. keep trying though, i guarantee it will get easier as u get adjusted to each others bodys and keep trying the lube and foreplay too that definitely will help in the long run. maybe try some toys to loosen her up...