My friend "accidentally" said "I love you"?

My best guy friend drove me home after spending the whole day together at a festival with friends and his family and said "Bye, I love you" right away he was super embarrassed and was saying "it just slipped" and he had no idea why he said that to me. He was like "Wow, umm I don't know why I said that umm ugh yeah, Yeah umm sorry it just slippped. Wow man I umm... don't over think it I don't want you to umm stay up all night." I just laughted it off I kept telling him its alright not to worry about it, but he was trying really hard to convince me otherwise by saying "Yeah umm I think its just because we said bye to my parets ummm yeah, Bye" A lot of "umms" and "ugh" if you understand. His cousin told me that he might have had a crush on me in the past but that was awhile ago and never confirmed. What do you? Also guys have you ever told that to a girl and it just slipped? If so was it just a random slip or did you secretly like her? If so how did you react? Girls did this ever happen to you too.

My friend "accidentally" said "I love you"?
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