Sex Drive Differences Between Men and Women

Personal post. Sorry in advance. I'm 31 and my husband is 33. We have been married for 6 years and in a relationship for 13. Recently, I have noticed that his sex drive has reduced significantly. I am 99.9% sure he's not cheating and we show love for eachother in many ways. I haven't gained a significant amount of weight and I'm still considered average when it comes to health. Sex has never driven our relationship, but I really want him and he seems to be the one that just isn't feeling it. Just the other night, I initiated, which was the first time we had sex in months and I was unable to keep him hard. This was not a problem in the past, in fact it was complete opposite. Anyone else my age experiencing this? Our relationship is great, really it is! I just have a significantly higher sex drive than he does. I'm not alone am I? Any other thoughts or suggestions to get things going again in the bedroom? I feel like I have tried everything.

Feeling hopeless.