Will try and keep this succinct and balanced - have a tendency to waffle!
Relationship problems and health issues - mine - have meant that our sex life has been been very unsatisfactory for, well a few years really. I haven't been up for it, dp has been been left feeling rejected and frustrated. We are affectionate with each other and frequency of actual sex can range from once a week to once a month or even less. He has tried to be understanding but can get very angry at times about it. I feel under constant pressure and that I have completely forgotten, mentally and physically, how to be a properly sexual person and the sex we do have is stuck in a rut.
Recently I read something based on what I believe is sex therapy practice. Basically a couple agree to have sex once a week and that time is totally devoted to being intimate together - rather than falling into bed knackered at the end of the night and attempting it if you see what I mean. Each week one partner leads, sets the scene and the other goes along with it as long as they are comfortable with it. In the intervening days there is not sex, no pressure - and hence no rejection.
I thought this seemed like a brilliant idea and suggested it. DP wasn't keen but didn't seem to want to really talk about it so in the end I said let's go ahead and give it a try and he agreed that it was worth a shot. The first night I led and whilst it wasn't fantastic sex it was close and intimate and we both enjoyed it. Since then though he was back to his old tricks of hugs which lead to him giving my boobs a quick fondle, suggesting we have a quickie, when we walked past Ann Summers in town nudging me and asking if we should go in? Also he seemed to be making excuses for doing his night - he'd be working late, he's going away with work.
Finally yesterday morning after a nice cuddle which led to his hand up my top I said would he stop with the groping and has he not been listening to a word I'd said. He got really angry, said I made him feel like a dirty old man, that he was constantly rejected by me. He ignored any attempts I made to contact him during the day and last night when we tried to talk about it he said he wasn't up for the once a week thing as he was so used to being rejected he didn't feel comfortable instigating anything, that he's lost confidence in himself sexually. This doesn't quite ring true to me as he often does instigate sex but I'm willing to give him the benefit of the doubt hence posting here.
What I kind of think is he's turning what I said to him about not knowing myself sexually anymore back on me for some reason - he's done it before with other things. But for the life of me after years of him wanting to improve our sex life and giving me grief over it I don't know why he'd sabotage a concerted effort to get it to work. Unless I'm missing something and I'm being some sort of control freak here? 
Sorry, it is a bit long isn't it? Any insights - even if I'm roasted - gratefully received.