38/m, she is 35/f, we've been married for 5 years and we have a 4 year old son.

Things are mostly okay in our marriage, but I started with the red pill because sex has dwindled down to once a week duty sex.

She doesn't turn me down, but she never initiates and I'm sick of it.

So I started lifting and dreading, taking her out more so that I could flirt with waitresses in front of her.

It hasn't work. Same boring duty sex. In fact, it's backfired.

She has started going to the gym, doing cardio and lifting and it actually shows. We went to the grocery store with my son last week and a couple of alpha looking guys in their 20s were actually checking her out and she smiled about it... It made me feel pretty worthless, but I didn't let her see that.

Now she just took off to the gym a few minutes ago and left me with our son, even though she knows I usually go to the gym on Sundays around this time. She just up and left without much of a word, just "i'm gonna go work out, back later".

I have no idea how to handle this. Any help is appreciated.

edit: I should have mentioned this before, Two years ago she did catch me having an affair with someone. It was a mistake because at the time our sex life was great, I guess I just wanted variety. I was pretty stoic through the whole thing and never apologized. She went quiet for a while, but eventually said she wanted to stay together for the kid and was willing to work it out, but that if I cheated again there would be a divorce.

I agreed and we moved on, but now that I think of it that's when the sex started to fall off...

As far as money, she makes about 5k more than me a year, so we're more or less even.