Hi female born 18/6/75 rabbit my husband born 15/4/65 been together 19yrs

MJME, smart women don't tell their husbands that they already know their husbands betray them. They defeat the third parties in their relationship cleverly. If I were you, I would be nice to him more than ever. If he still has feelings for you, he would understand which one is good. However, if he still stays with his new girl, then I think you'd better find proofs that they are together. Give him a chance to correct his mistake. If he didn't, then I think it's time for you to leave. Of course, you should let him pay for what he has done to you.