That's your only friend that

[joham]

That's the only friend of yours that I've ever met.
That's your only friend that I've ever met.

Do the two sentences mean the same? Thank you in advance.

[Tdol]

No, the first means that the person has a number of friends and you have met one of them. The second doesn't really work, but your only friend would mean that the person only has one friend.