Wimmens reject/dowan sex for many reasons but usually is due to the other half.
It could be as simple as u forgot to do something u promised to her.

Even if u apologised but she may not fully forgive. Small stuffs accumulates becomes big issue.

Best is u discuss with her and see how to find solution.

I feel you bro..i also buka tered few months ago about my wife not interested in sex.

I found my answer here.

Try to find a hobby, make yourself busy. Don't eat outside. stay loyal in your marriage.

You will feel proud of yourself.