My husband lied.

He randomly asked me if Facebook deletes old, deactivated profiles after a while. I said I didn't know and asked why. He said he thinks he can get on his old one, from when he was with his ex/baby mama almost 3 years ago. He went to his email address and reset his password and logged into it. When we had first started dating 2 years ago, I had logged into it because he used the same password for everything lol and I was curious. So I logged in and read his messages with his ex, where they were either talking sexual or arguing. Nothing else. Well, I deactivated it and hadn't looked at it since that day. I didn't touch anything, I left everything the same, just read through his messages. Well when he went to his email to reset it, there was a message in his deleted from 10 days earlier that said it had been reactivated. He went to it, and we were looking at it together. I said to go to his messages, and all of them with his ex were deleted. I said "I'm surprised you don't have any with her." He said, "yeah, I know." So he had already reactivated it 10 days earlier and deleted the messages. Why would he lie about it? 
Edit: I didn't decide anything about his Facebook. He reactivated it so we could look at it together then deactivated it again right after. The point is, he acted like he hasn't been on it in 3 years, but he logged in 10 days ago and deleted them.  Why would he lie about it? Log in and look at old messages with his ex? I don't think he's messaging her now or anything, I just think that's weird. Why even activate it to look at? Every post was about his ex. Literally every single one. 
Edit: The point isn't what he did before we were together (talking to his ex while he was with her). The point is that he reactivated his Facebook 10 days ago without telling me he did it, deleted the messages, reactivated it now, and acted like it was the first time he got on it in years, and like he deleted the messages a long time ago, like when they broke up and he deactivated it before he made his current one. The point is that he got on it 10 days ago but lied and acted like today is the first time in years and the messages weren't there at all. But they were. He deleted them 10 days ago.