Hey, this is my first post here and well i just need to get this out more than anything i think so here goes.
First off ive been with my guy for 5 months now. it was all fine up until about 1-2 months ago.... he stayed over and got up before i did and checked his email ect then went outside.... when i got up i jumped on the comp and his email was open and in a folder called "FAVS" there were 3 emails from a chick so i naturally clicked one and there were pics of her clothed but looking down into her clevage if u know what i mean

so i called him in and asked him bout it got really upset ect he said she wqas just a friend and deleted them straight away.... so this kinda has made me insecure about the relationship.
A few weeks after that i was going thru my junk email and i had a email from a dating site which i joined ages b4 i met him and it was one that said new members who had joined etc and guess who had joined up!! my so called partner! so i told him i knew he'd joined this dating site and he said it was just to make friends nothing more! Said he wouldnt go on there again and it was left at that.
A few other little things had happened but i just let them slide thinking i was reading to much into things because ive been feeling insecure after these few incidences.
now this morning i went to hotmail to check my email and it was already signed in said i had new msgs so i checked them and realised it was signed into his, there was another 2 emails from a chick so i opened the second one from her and the convo started with her asking the last name of my partners EX gf the reply from him was this:
"hey there sexy how ru :-) how u been?? havent seen u for a while
> wats new??? umm her las name is ********"
WTF is this about!!
then she just replied today and said
"Hey
Im good thanks and you?
Are you still with your gf?"
Am i right to feel fu(kin hurt angry pi$$ed off or what someone please give me advice..
His best friend and i had a chat friday night and he reckons that my guy is deeply in love with me and is very serious about the relationship!
even reckons he wants marriage later on.... my partner always tells me he loves me misses me etc so what the heck is going on

im so upset n angry i just dont know what to do!
i havent brought up this email incident with him coz ive got a feeling ill be accused of snooping so im just really confused

please help!