Boyfriend acting weird

So my bf moved into a new apartment. We are long distance so communicate by FaceTime and calls. Well now that he’s in a new place with roommates ( friends he’s been kinda weird. He would not say he loves me on the phone or FaceTime only in text, he barely talks to me, and hasn’t even introduced me to his roommates. I had a roommate last year and day one when I was FaceTime I was like hey this is my roommate and she would talk with us and all. His roommates have been in the background talking to him and never once did he saw hey I’m talking to my girlfriend/come say hi etc. his rommmates are all previous friends who know we are dating. I just don’t get it I feel like he’s trying to hide me and we have been dating for 4 years. What do I do? What bothers me most is he can’t say he loves in front of them like come on we are 23 not 13!