Advice please..

So I've been feeling depressed lately and it has alot to do with my boyfriend. I just recently moved in with him and since I've moved in he really doesn't seem interested in sex with me and I can't figure out why.. he's been kind of different I'm just scared that he's getting tired of me.. I really dont know what to do or say. I really don't want to lose him. I love him with all my heart.. please tell me what you ladies think! Thank you!!