If the joint account upsets you can’t you open a new account and both pay relevant amount in for bills I had this crossover bit too so I transferred the account back into my name and he transferred the money in because I don’t think I could of handled seeing that either. I know exactly how you feel though his contract phone was in my name so I could see how much he talked to her when he told me that nothing was going on on the day he left he phoned her for 2 hours as soon as he left me and on the month we split he sent her over 1000 texts but nothing was going on yeah right so I couldn’t put up with seeing it as it was driving me mad so made him pay his contract up and get one in his own name.