Should I be upset, or is his explanation correct? I was looking at the history on our family laptop...?

[Empire539]

Well, I can't tell you what you're husband is doing on the Internet. However, it is true that most every site visited leaves some sort of mark in the Temporary Internet Files directory. Many times websites have advertising to pay the costs of maintaining the site, and it's quite possible that "singlesnet.com" appeared as an advertisement that was loaded along with another website. As for Facebook, Twitter, and MySpace... they are fairly common to be linked to news articles (such as those giving options to post the article on the site), so if there is an icon or small graphic related to them, then usually it's not a big indicator of anything.

Temporary Internet Files themselves aren't a very reliable source of web browsing history; for instance, I have several links in the temp folder related to porn, but I don't visit porn sites; they were loaded through advertisements via other sites.

A (possibly) better indicator might be the websites typed in the URL address bar. Or perhaps the saved list in a Google search (Suggestions must be off for you to view them; check the Preferences). Usually pressing Ctrl+H will give a more robust form of internet history (it opens to Favorites by default; click the History tab to view the history), in order by date of websites visited. In regards to Facebook or MySpace, if there's more than a few pages of it (i.e. people's profiles, etc), then it's possible he hasn't been totally honest about having those accounts.

But this is just all speculation; it's up to you whether or not you want to trust him.