What does it mean when the guy you're talking to let's "I love you" slip out but didn't mean to say it and apologizes?

Been talking in a romantic way, call each other baby and love, we've been intimate but haven't made the relationship official yet as were still in the getting to know each other stage, but both established were both only talking to each other exclusively. He walked me to my car and was saying Good Night and it accidentally slipped out. He apologized and I said it was okay, down played it all. I later messaged him asking if he truly felt that way or just like a general slip up. He said he didn't mean to say it, that it just slipped out but he did have feelings for me and wants to continue spending time together but didn't want to rush anything which I agree. Just curious if guys do say it by accident or there may be some truth to it and just didn't mean to say it yet? Need a guys perspective.

What does it mean when the guy you're talking to let's "I love you" slip out but didn't mean to say it and apologizes?
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