From our article “5 Signs of a One-Sided Friendship (and Exactly What to Do About Each)”: The difference between a friend who is busy and a friendship that only runs one way, and what to actually do about each.
Count it properly. Memory flatters whoever is doing the remembering.
Big in your terms, not objectively big.
A rough patch and a pattern look identical from the inside. Time is what tells them apart.
The question the whole thing turns on.