Why would my boyfriend delete his messages?

Blueeyes28
So my boyfriend and I have been going out for three years now. We have a one year old daughter and live together. The other day I was logged into yahoo and the next morning I went on to check my mail. I clicked on mail and saw a Facebook notification from this Danielle girl. I clicked on it and then realized that it wasn't my yahoo mail it was my boyfriends. I forget what the message said but I noticed that it did sound like by what she said that he had messaged her first. We have this whole rule thing about talking to other girls or guys without the other one letting the other know. He never talks to other girls at all. This girl I noticed was the same Danielle he had went on a date with a few weeks before we met. Nothing happened and they didn't really talk after that. I noticed in another notification that she had accepted the friend request which meant that he sent her it. I went into the history and he had searched for her on Facebook. So pretty much he went out of his way to search for not only a girl but a girl he went on a date with a long time ago that is very attractive and very slutty. He messaged her and not the other way around. I went onto his Facebook to see what he wrote her but both messages were deleted. All of his other ones from me and other people were there. It clearly seems suspicious like he is trying to hide something. I looked at his phone tonight to see if there was anything from her and he had added her to his contacts. But if everything was innocent why delete the message? He is honest about everything else so if it was innocent he probably would have told me. How to I go about bringing this up with him so that he doesn't turn it around on me about how I was on his Facebook even though he had done that to me before but I actually had a real suspicion. I just wanted to know the truth and what kind of trash is around my daughter. But I just want to know why he would do this and what I should say? If something is up what can I do to stop this? What can I do to make him tell me the truth?
Why would my boyfriend delete his messages?
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