Hi and thanks all for the replies.
Firstly, no, I wasn't aware he'd been to link removed looking for highschool friends, he didn't tell me. I didn't know anything of it until I found the emails in his email programme and there are no other emails in there belonging to other friends either, just her. But then she may have been the only one to reply.
I wasn't going to mention it, but my husband has had affairs in the past and so I guess that is why I snoop on him, I still don't trust him 100% and it's why I suppose, I'm worrying over this contact he has with the ex. Even though it appears harmless, how can I be sure it won't lead to more?
He did think a lot of this particular ex at one time, she was his 'first love', they have a history and were at one time engaged to be married themselves, another reason why I'm feeling insecure about the whole thing