Romance is gone

So my boyfriend and I have been dating for four years now and I feel that the romance is dying. I mention to him that it would be nice if he were more romantic and his excuse is that he doesn't know how. I've sent him links, tagged him on social media but still nothing. Sometimes I just feel like he doesn't put in half the effort that I do into this relationship.  Plus he works all day and I barely get to talk to him. I've been feeling pretty down about not speaking with him but when I try to talk about my feelings he just says I'm too sensitive. Wha should I do?