I think there may be some signs in this regard. Seeing them take advantage of friendship. For example, he always asks you to pay money and promises to pay back later, but in reality they never pay back.
He asks you to do things that you do not want to do constantly, and if you do not accept, he threatens to end friendship.
They use them as an excuse for their friendship, and they use it as an excuse to be personal, even if they have made it clear that they are uncomfortable and that they are not yet ready.
When you realize that you have nothing in common and that spending time with them is on a mission rather than a fun activity.
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