You do remember that Cole is the majority to why the Charmed Ones are alive where Leo their Whitelighter was as useless as he could possibly that those moments, right? Even in The Good, the Bad and the Cursed when Victor hated Whitelighters, good job Leo to prove yourself to your future father in law.
Also at last when he finally got the message that she wants him and everyone wants him to leave. Guess what?
He was able to leave and Paige and suddenly everyone wants him to stay and again to leave them. If you watch this scene. He does admits she is the reason he got insane.
https://www.youtube.com/watch?v=lFy603xgZn4