Losing spark?

I love my boyfriend, he's the best man i've ever met. I want to get married and start a family with him. But I suffer from depression and I don't feel that spark in our relationship anymore. Some days I'm so depressed I don't want anything to do with him. I see him often and we text everyday and our sex life in fine (minus the fact that ive never orgasmed). We usually do the same 2 or 3 things when we see each other. Im afraid of getting bored of him because I really do love him so much. How can I get that spark back that I had earlier in the relationship?