My shit sex life

It been Severn months now since I have had sex, why ? I don't know my wife and I had a rich and fulfilling sex life but over the last few years its not just slowed down its fucking stopped dead
I'm 43 and have left myself go a bit I've put on a few stone but she's not the same either .the worst thing is I really want her I find her so sexy she's 36-30-38 great tits and ass but she just stopped sleeping with me.
She used to get dressed up for me in bodystocking and stockings and suspenders and boots I'm getting a stuffy just thinking of it

I have only had sex 3 times in 2 years I'm gutted
Finally fucked my wife 16th June