Sexless marriage...

Hey! So my hubby and i have been married for about 6 months. Been together for 5. We are very much in love, he is so amazing and good to me. I am very fortunate. Only thing is we don't have a lot of sex, and it has been this way for a couple of years. It isn't just his fault, it is actually more mine. He tries often, but I don't know I'm just tired. I'm 30, he's 35. I'm not even pregnant or a mom yet. I did gain like 15 pounds, so I'm not feeling sexy, I'm sure that has something to do with it. He's always telling me i look great, but ya know... it's about how ya feel. Although there was a situation- 2 years ago we were on vacation for a weekend. We had sex and went to sleep, in the middle of the night he was in the bathroom "taking care of himself." I was so upset I felt like he cheated on me. I asked how often he did that (while I'm home and asleep) he said a few times a month, it just helps him sleep. I was furious and hurt... I said that he should be waking me up so we can have sexy sex. At that point in our relationship I was trying to make our sex life more active, and I was the one trying. So after that incident, something switched in me... I felt, unwanted uneeded in that moment. Also during that period I would give him oral a couple times a week. Now it's every few months... again because I feel like why should i, if you're just doing it all the time anyway? He said he wouldn't do that anymore and that I was right for feeling that way. I actually believe him. I know he does it when I'm not home, and that's fine. Any advice for how i can get over this? or how to spice it up? he is a great man, and i love him. We used to have such a strong sexual chemistry. I want to get some of that back brfore i get pregnant and things change. I dont want us to become roommates.