I've been with my DP for 2 years and we generally have a very good relationship. The only problem is his ex, who was with him for a year and treated him very badly by all accounts (corroborated by DP's best friend).
She still calls and emails my DP regularly but since I told him how much it upsets me, he no longer responds unless he has to. He also shows me when he gets an email from her. They need to exchange a few emails at the moment as they are organising for him to send some of her stuff back (long story - it should have been done much sooner but never mind).
He sent her a brief email yesterday. It was neutral and to-the-point - just discussing returning her stuff. I have no problem with this as I want to get her stuff sent back for all our sakes! However, she then sent him a very long email back including gems such as: 'I still see us as Romeo and Juliet', 'eat one of my favourite ice creams for me', 'I had a really intense dream about you last night' and 'do you still have the lock of my hair'?
Ironically she also asked after me, but I can't take that seriously after the rest of the email!
I don't think she realises that he shows me her emails. This has been going on since we've been together (2 years!) and I'm just so fed up of it. I know it shouldn't bother me because I know he's committed to me, but it does.