Libido??

Ok! So Iv been super busy between working and classes and I feel like Iv put my sexual desire on the back burner and now feel like I can't really connect. Me and my boyfriend have been together for almost 3 years and when we first got together we used to have sex all the time. We now live together have have sex or do "stuff" probably twice or three times a week. He is noticing a change and feels like I'm just not into it anymore and it is starting to affect our relationship. Obviously I want to be into sex but I feel like Iv put it on the back burner for so long I'm not sure what I can do to change it? Any tips or anyone with similar problems?