I feel silly

Me & my boyfriend have been together only 7 months, but we've been in love for a lot longer, we just never got together before because we were both too worried that the other person felt the same way (we were 13 when we met). Anyway, when we first got together it was amazing, there was excitement, lots and lots of sex, lots of kissing etc. Now I'm lucky if we only have sex once a week. It's not all about sex obviously. But my sex Drive has been constantly high since we started having sex, and his has slowly but surely diminished. It's still kinda there but nowhere near as before. Last week when he came to stay with me, I decided to dress myself up real sexy (short skirt, no pants, a baggy tank top tucked in, knee high socks, a choker, hair tied up, red lipstick etc) and I got our wrist cuffs out and cuffed my wrists together and waited for him. He walked into the room, sat beside me, pulled the blanket over me and switched the TV on. I felt kinda hurt over that, and I told him later on. He apologised and said he doesn't really have a sex drive, I respected that and now I'm backing off a little (sexually) as I don't want to freak him out. Am I silly for getting upset over that? I miss our 'honeymoon phase'! Any ideas on how I can calm myself down sexually? 

I know it's not the case of my boyfriend is 'getting it elsewhere' as he's pretty much always with me. If not, we're on the phone chatting.