What made you suddenly lose interest in someone you were pursuing?
When I found out they liked me back. Not interested in someone with poor judgment.
Poor Judgement
Explanation
Explain Bear
Alright listen up, you dunce. This joke is funny because the person is saying they lost interest in someone once they found out that person liked them back. The joke is, this person thinks anyone who likes them must have bad taste and poor judgement. The joke is, they are calling themself bad.