Hi all. I am sadly in this situation as well. I don't have any answers, but I guess it's nice to speak to others the same.
I had a thread of my own, and one poster told me that I was abusive towards my husband, for asking for sex 
I used to initiate often, and was rejected 90% of the time. I don't do that any more. He will initiate perhaps once every 3 weeks, however, I worry that he does this so that he can "tick me off" the jobs list for another 3 weeks. However, afterwards he does say how much he's enjoyed it, and how we should have sex more often. I feel like screaming, "yes, so you keep saying!"
I've tried talking about it, and he always agrees that things need to change. More recently, I actually broke down and sobbed about it. Twice. It's too soon to know if this outburst will bring about any change, as he's had a horrible cold, which seems to be lingering.
My first DH had a high sex drive, which I found a bit annoying, as my libido was lower then. Oh, the irony! However, he cheated a lot, which was horrendous, and sometimes I tell myself that the upside of DH not having a high sex drive, is that he's unlikely to cheat. 
There really aren't any excuses, however, recently he blamed his weight gain, and said that he was embarrassed by his beer belly. But, he makes no effort to lose weight, and it feels out of my control even more, knowing this. The thing is, he carries the weight well, as he is of large build and tall, so I couldn't care less, I still fancy him!
I don't want to leave him, I love him and everything else is fine. I have no desire to sleep with another man. There is intimacy, lots of kissing for example, and whilst this is good, he would be happy to have a really long deep kiss, and then go about his day, whereas it leaves me wanting so much more. It isn't an intentional tease, but tease me it does!
Occasionally things will improve. Last year on holiday for 10 days, we had sex at least 5 times. This is the only holiday we've had where sex has been frequent. But once home, everything was back to normal. It was like being on Bullseye..... "Here's what you could have won".
I'm 48, and terrified that I will hit menopause in 3 years, and lose my libido. And then regret the lack of sex, when I really wanted it.
Sorry, not helpful, but you aren't alone Op.