In brief: relationship has been bad for ages. Discovery of emotional affair and partner admitted having sex with the OW within the last few months. Partner is much older and retired early on in the relationship (effectively put themselves in the redundancy firing line)and as a result did the following- paid for a refurbishment or 2 in my house and in exchange paid v low contribution to bills (the reasonableness of this has lessened with time). Now we are splitting and he has recently paid out about £1800 on bills for a new bathroom. Overall he has had an easy ride bill-wise. He used to pay 10% of the household outgoings, bearing in mind retired etc. Recently with no mortgage, this ratio has increased to nearly 50%. My children are splitting feathers over his betrayal of me and say don't pay him the £1800 back as he should really pay YOU back rent etc and appreciate the easy time he's had. He is implying he won't leave without the money. AIBU to think, you've had an easy time at my expense so you can leave without it?