My husband (28M) lied to me (28F) about the origin of our future daughter's name. His ex came up with it.

Edit: For clarification, I am not pregnant yet, but we are actively trying to get pregnant.
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My husband and I have been together for several years, and it's been a great relationship. We've had our ups and downs, but we've worked through them. One issue we had was his lying. He would lie to make situations better than they were, to not get in trouble, to not hurt my feelings, etc. We had long talks about it, and it seemed to have stopped. I told him how much the lying hurt me and made our relationship weaker. I also told him that I was done with it because it made me feel crazy when I could swear he was lying, but he would insist that he wasn't, just to find out that he was.
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He said that he was done lying because he could see how much calmer and more secure I was when he was telling the truth.
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A little backstory: When we started talking about kids and names about 2 years ago, he said that her had a specific name picked out for a little girl. I'll just say it's "Addie Mae." I loved the name and agreed. We both want a family, so "Addie Mae" has come up a lot in conversations, as have ideas for boys names, number of kids, etc. We are so excited to be parents, so it's not like we said it once and dropped it and never spoke of it again. We talked about it a lot.
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Currently: Lately I've been feeling like something is off. I had a feeling that he was lying about his ex contacting him, so I did some snooping. I'm not proud of it, but it was the only way to know for sure. I was hoping that he wasn't starting to lie again, so I needed to know. I went on his messenger and looked at his conversations with his ex. She hadn't contacted him, so I was happy. I wanted to see if she had contacted him at all in our relationship since he said she hadn't, so I scrolled up. It loaded and when I scrolled up a little more I saw something that caught my eye. It was a message from when they were together which said "If we end up getting married and having a little girl, can we name her Addie Mae?"
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I am so devastated, and really angry. He NEVER told me that his ex girlfriend came up with the name, and that was what they were planning on naming their child. I want to call him out on it, but then I would obviously have to admit how I found it. I know he won't be mad about me snooping as we have open access to each other's phones. I'm sure he forgot the message was there, but I KNOW he didn't forget who came up with that name.
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How should I bring this up to him? Should I bring it up? Is this as big of a deal as it feels like it is in my head? I was so instantly in love with the name and I've loved it for the last few years, so to suddenly change my mind would merit some questions from him about why. And frankly, I'm so hurt and mad I don't think I could have him question my motives much before I just let it all out.
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TL;DR - Husband wants to name our child Addie Mae. I agreed, but didn't know that Addie Mae was the name his ex girlfriend had chosen for when they have a child. I am so upset.


Source.