Why has my husband got this Facebook account?

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I know it's wrong but I have been snooping. For a number of reasons. Mainly sexual. For about 18 months when we were first married, he totally went off sex with me and I know he was using porn a lot then. We have had a number of problems, since then, many as a direct result.

Anyway, I decided that an adult male is unlikely to be so OK with never having sex. He makes half interested attempts every now and again, I just think something else is going on. No evidence of that though.

I have found an email address under a different name. And when I got into the email address there was nothing really incriminating in it. But there was a Facebook profile under the same name. I hacked into that and there is no activity on it really, just a lot of random friend requests. No messages or anything. Activity log is empty. I am entirely sure it has been used for a while to be honest.

He has three friends on it though. All American high school students, two boys and a girl. They are mutual friends with each other.

From his history of emails it looks like they became Facebook friends in about 2010. To be honest I think they might have mistaken him for someone of the same name in their school, but why accept their friend request?

I can't see any interaction. I can't pinpoint anything wrong. But the very fact is there seems a bit strange. I can't ask him about it, I just can't.

Any ideas?