Maybe he is just not the warm and fuzzy type that says these words easily. Nine months is not a long time, but you will definately find out if you are compatible or not by living together. I say just be patient and let things unfold and see if your relationship stays the way it is now before worrying about it going to the next level. Who knows, in another 9 months you will know better if it is something you even want to take to that level and you should def have your answer by then.
Maybe your boyfriend has problems with saying what he feels maybe he has been hurt before in the past and is to scared to open up or express himself in this way,as long as the relationship is good i wouldnt worry to much about it,just enjoy your relationship with him and when he is ready he will tell you he loves you.
Hm. Well, I was going to tell you to be patient because saying I love you can be a very big step for some people . . . but you threw me off with the fact that you've already moved in together. Who's idea was that? I guess I'm a little concerned that you two jumped the gun with setting up house without laying a strong foundation first. Does that make sense? Do you talk about a future together? I think some heart to hearts about where this is going would be great. If you two are going to remain together and one day marry and all that, you want to be able to really talk to him about what his true thoughts and feelings are. Start working on that now. I'd say, be patient, see how things play out etc if you weren't living together but you've already moved the relationship to the next level. So you two need to talk more. Living together makes it a reasonable request to ask if he loves you. Or where he sees this going? So, set up a special date and plan on talking about all of this.
And it could be a simple answer as to why he doesn't say he loves you. He may have not heard that much growing up, may have a lot tied to the phrase and fear holds him back, or maybe there is more. But talking to him about it is what you need to do since you are living together now. good luck