Should i ask him?

In a 15yr relationship..recently going through my Facebook messages and found a message my boyfriend send some one in 2010 it said "hey do I know you lol" no reply and he didn't continue to message. Don't know if I should ask about it or just try to ignore it. We just got engaged this Christmas and I found it today. Just wondering if I should forget about it since it was almost 5years ago.

It sounds pretty innocent. Just forget about it.

I guess it does seem innocent, I was just concerned because she was cute and her only pics were of her in her bra....but thanks for responding.

I would dismiss it. It sounds like nothing came of it, and it was so long ago. Besides that, if you bring it up your fiancé might even be insulted to learn you think something may be going on with someone he messaged nearly 5 years ago.