Hi..Don't worry petal, men are funny creatures at times...It is possible he is feeling uneasy about your ex coming back from USA..He may be acting fine when you speak or see each other, as he has the reassurance from you, telling him that everything is completely over. But may be when he is on his own, his mind might start going into overdrive and he's thinking things that aren't actually happening...If i were you, i would maintain the same level of contact, don't adjust your behaviour, as then he may suspect something is wrong...Or just be honest with him and explain how you are feeling; he may be honest with you back..Hope you feel better soon...x x