my partner of 15 years started a new job last year and he has become very close to one of his female colleagues. She is in an abusive relationship and confides in him a lot. I noticed our phone bills were becoming really expensive so i checked them online and found out that he's been sending her over 600 texts a month. When i confronted him he said it was someone elses number then owned up that it was this woman. He promised to stop sending as many texts but said he won't be told who he can have as a friend. I've never had an issue with trust but i'm becoming really paranoid and suspicious he takes his phone everywhere with him and has even taken out another contract so i can't check the bills. I don't know whether to confront this woman or not i wouldn't want her husband finding out and turning violent with her but ican't just sit back and watch my relationship die. He says he'll leave if i can;t trust him i feel like i'm the one in the wrong :(