This was discussed before... even in the chatroom too.
Maeglin’s desire for his first cousin, Idril was viewed as something twisted. His lust for power was only second, in my opinion, only to his twisted desire for her. Plus, Tuor's presence probably caused him great envy. Imagine Idril in love with a mere human... and Maeglin probably considered himself "above" Tuor's rank.
Morgoth used that desire to manipulate him. It can probably be said it was part of the curse of the children of Feanor that it turned out the way it did, since it eventually led to the fall of Gondolin.
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