found things on boyfriends computer

Ask him to delete it? He doesn't really have a good reason to say no.
To be fair though, you are kind of bringing this upon yourself by sifting through all his stuff...

"You want me to delete my past, my memories, part of who I am?! How dare you! I'm ending this relationship!" - Lol.

Um, she's not like asking him to delete pictures of him with his dead grand-parents I think its fair to ask him to delete any dirty msn conversation histories etc.

It's not fair if in his past he did have feelings for those msn girls and you're asking him to wipe out his memories because of you. Being with someone is about accepting who they are, not moulding them like clay until they meet your requirements.

His life, his past. He has every right to want to save some aspects of it, if only a series of notes on his computer.

In the end, the chances are that you are simply "his next girlfriend". He may know that, and simply be with you because he kinda likes you and you are convinient, or he may be thinking "is she the one?" However, I doubt that he would tell you he loves you if he didn't at least *think* that he did, but who knows if he is in love with you? One can only truly evaluate ones relationships when they have all passed, and one can weigh up how they felt with different people. Chances are, he *thought* he loved the other girls as well, but maybe he has realised (through being with you) that it wasn't real love.

basicaly, you have to accept that people have pasts, and that they might not want to be explicitly honest with you about them (for exactly this reason - people get upset if they don't think they are really unique and special). The WORST thing you can do is bug him about it. Do you have any reason to doubt insincerity on his part, setting aside the fact that (OMG) he said "I love you" to someone in his past and then lied about it (understandable, how else could the conversation have gone - "oh darling, I have never felt this way for anyone before, I have never told anyone I love them before... how about you".... "well, actualy there was this one girl" I don't think so). if you put pressure on people, if you put them in uncomfortable situations, then they are going to wriggle out of them. They will not suddenly give you the answers you want. Put too much pressure on (ie. keep bugging him about this) and they will run, and run fast. In the end, people don't want the hassle. I wouldn't risk it. Just be lovely, drop the issue, keep an eye on how he acts and take things from there.

If you were my girlfriend and you had been prying around all my personal stuff im sorry but you would most likely be out the door....

I don't think dirty msn conversations are really necessary for him to maintain his 'memories.' It hardly seems like a big ask to have him delete that kind of stuff.

Seems strange if he has saved conversations with his ex girlfriends. However was this when they were going out when he said those things? if that is the case then it is in the past he is with you now not them, trouble is yes you being jealous will ruin the relationship.

Ask him to delete it? He doesn't really have a good reason to say no.
To be fair though, you are kind of bringing this upon yourself by sifting through all his stuff...

people have different feelings about things which link them to their past, I keep all my ex's emails and messages, the sexy ones, the ones where we were arguing, the ones that make me feel sad... I dont usually think about this, but now I am I feel afraid to loose those precious traces - I dont think that reading even kinky emails from an ex you loved is likely to turn you on, I am thinking in a more sentimentalist way, I dont want to loose the whole picture of the good and the bad, even though I know it will fade... dust in the wind. its so special, even if it could never work and I felt it was right to break up, we shared something that was unique. I hope I feel that way about any future relationships I have that turn sour. what a rant, people with think I am soppy...