Lying husband

Long story short my husband is a liar but is trying. He's lied to me about small things such as who he was with before me, (I could care less who he was with before me, but he fact he lied was the issue) he has two kids from his previous marriage and he lied to me about driving to pick them up even though his ex was suppose to bring them here) he's lied about where he has dinner reservations with people from work, what's the point in that? We are in counseling and he said he won't lie again but my thing is, he lies about small things- what's he hiding? Does anyone have a similar story or advice