Alison, I am so sorry ((((hugs)))))))). Listen to me this is your son NOT your H. Why are you doing this to yourself? guilt?for what ? the only thing I see you guilty of is trying to be the best mum you can be in the midst of terrible circumstances. You must separate your thoughts of son and husband. Yes he is pulling out all the stops thats easy on day one, wait awhile and be patient. Did you really need to ring 3 times. Step back give yourself some respite from them both. I have 2 sons, I admit they didn,t cause me grief but I do know lots of parents whose kids did and do. Your son will be lapping this up for now,boys of 15yrs are short on finer feelings,its me me me. He is playing you Alison and you are going to have to DB him as well as H. Do not even concern yourself about what the ow is thinking. Your son has gone to live with his Dad for sons sake, not to help break up his Dads affair. It might cause problems but they are not your problems. Concentrate on your girls, otherwise you will be in the firing line from them saying things like " you worry about son when he's here causing trouble and problems and now your worrying about him when he's gone" what about us. So you asked H to leave the first time around-for what leaving his socks around? no I guess not. I am sure you had reasons but you haven,t come to terms with that. He left the second time because he chose to. He is an adult, your son may thik he is an adult but he is very much a child still. This may be his last chance to get himself on the straight and narrow and prepare for his adult life by getting a good education, you know this and yes it hurts that it may be H that helps him do it but if thats what it takes so be it. You have to bare this burden too for sons sake. try and keep extra busy and take care of the girls and you. It may not be a very long stay and then youll be thinking why did I not do so and so whilst I had the chance. Stay strong.