Finding out that the boy you like is actually in love with your best friend is not a good thing because it means that he is not interested in you and probably never will be.
Context: "I thought a boy liked me once and he later came to me and said he was in love with my best friend" Claim: "I was really happy that a boy liked me but then later found out he was in love with my best friend"
Considering the context, is the claim true, false, or unknown?