Is common friend Ayan Mukerji to be blamed for the Ranbir Kapoor - Katrina Kaif break up?

If insiders are to be believed then just like during Deepika Padukone's break up with Ranbir Kapoor, good friend Ayan Mukerji chose to play it safe even during Katrina Kaif's split with RK. Looks like Ayan does not mind breaking ties with Ranbir's exes over ruining his friendship with bestie...