<human>: Condense the text into a few key points

This is super dumb but:

I have a really close online friend. My husband is not internet savvy at all. So when we were first dating and he asked about this friend, I said that we met during high school and then they moved to a different state later. It's the only lie I've ever told him. 

He brings up the friend occasionally and I find it so awkward. He asks things like, oh, where did you hang out together? I normally say something non-committal like "oh, you know, the normal places" but I try to change the subject as soon as possible.

Like I said, I know this is stupid, but I have gone along with this for over a year and a half at this point. It's just going to be so incredibly "WTF"-inducing if I tell him that I made the whole thing up. Honesty has always been a huge part of our relationship and I know it's going to hurt him if I tell him I lied. 
It actually has me feeling depressed and makes me want to stop talking to this online friend so my husband doesn't bring it up any more, which is completely silly. 

What the heck should I do!!?
<bot>: Lied to my husband because I didn't think he'd understand online friendship. Now it's biting me in the ass.