Husband being overly friendly
My Husband and his female coworker seem to overly friendly with each other. I asked about it couple of times and he denied anything was happening between them but then he promised me that he would stop being overly friendly. He stopped for couple of months but then went back to being overly friendly again. I even taught him sending flirtiest mail to her. He says he forgot about the promise and it was just an innocent mail. Now he says he will never do this again. How can I believe him again?