Just need a rant!!

So my partner has now suddenly just started to try and lose weight, even though he hasn’t bothered for the 5 years we’ve been together, and I feel like it’s becoming a problem for our family. We have 2 daughters, a 4 year old and an 11 month old and he comes home from work, goes to the toilet for 30-40 minutes then comes out and exercises constantly. He isn’t spending anytime with our daughters or me. I have tried for years to get him to become my workout partner but he never would he would just sabotage everything I did by buying me chocolate and junk food. This is really starting to piss me off but I know if I talk to him about it it will cause arguments and me saying I’m trying to control him! Guess I’m just gonna have to look after the house and our 2 daughters while he does his exercising which really is not fair!