Fake support

[GrandmaGotRunOverByAReindeer]

My husband loves to tell everyone how well I'm doing with my weightloss and fitness drives. Posts supportive Facebook posts and comments, gushes with mil, tells his workmates my running times etc

But really he complains about me going to fitness classes, says I talk about the gym too much, thinks I'm only going there because I'm having an affair with someone (??) points out the changes in my body that aren't nice (saggy) skin) tells me the gym is more important to me than the children, says I don't at enough, blames very sneeze/niggle on the gym, does his best to stop me going and make me over eat.

I'm getting really sick of it but everyone thinks he's really supportive, including him!!

YANBU. If he genuinely feels your family aren't getting enough time with you or you're not pulling your weight he should bring it up with you and you can agree on when you'll be home etc. But moaning about saggy skin and trying to get you to over eat while posting fake cheery posts on Facebook would drive me mad. Does you getting fit maybe make him feel inadequate and guilty and he's taking it out on you?

I wonder if he likes the attention being supportive in public brings him rather than actually being supportive iyswim.

My friends STBXH was like this - posting all over FB about how much he loved her, how supportive she was, what a good stepmother she was to his 3 boys.
In RL he was angry with her all the time, left all the parenting and housework to her (even though they both worked FT) and was a complete hypocrite.
When she found out he was having an affair and told friends, his one concern was that he looked bad in front of her friends - not that he was being an absolute arsehole and breaking up his family.
There's a certain breed of person who wants to look good to acquaintances but the real them comes out with those close to them.
I'd be really childish and for every fake FB status I would put a comment with the unvarnished truth...could cause ructions though.