Just who it says Jeff--the Dick, John Twist
Alma obviously knew but I don't think she understood and perhaps knew Ennis didn't understand his own feelings either. She had remained married to Ennis for 8 years after seeing him with Jack so it's not fair to say it was the cause of their divorce. Had Ennis been a better provider, more willing top be social with Alma she would likely remain married to him. She did love him.
I think that is where Annie goes wrong maybe, may I dare say!!That Ennis's wife continues to be married to him, after she sees her husband and Jack kissing so much and mutually!!?Hugs to you all!!