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If I were to say such a thing, I'd consider it a lifelong commitment though, at least as serious as a wedding vow. I generally don't like it because I've been on the receiving end of "I love yous" and even "I will love you forever, no matter what happens" only for the girl to end things. I might have gotten my hopes up a bit one time long ago receiving such words. Now I put no stock into it.
Not one of those who thinks of these things as lies, mind you, just that people can change their minds later. So I think it's often foolish to say it unless someone is truly and deeply committed and has spent a lot of time thinking about it.
Ofc I did mean it I wouldn't say it if I wouldn't