Lost sex drive and/or loosing feelings?

So I've been with my boyfriend a year and 6 months and I judt stop being interested in having sex with him. I mean it feels good I just it doesn't please me as much as it used to. I get horny I judt dint want to have sex and talking about it is starting to make me feel uncomfortable. Sometimes I don't know how I deal with him and other times I want as much attention as I can get. He can still turn me on though which I find weird but I'm just lost. Is there anyone who can tell me what's going on or can relate?