Harvey Specter was all about loyalty in Suits, and that is why his relationship with Mike Ross worked so well despite all the issues they had throughout the show. While Harvey was initially depicted as a cold, heartless man who only cared about playing at the highest level, later Suits seasons explained why the character was like that. Harvey was always particularly concerned about loyalty and never stabbing a friend in the back, which had to do with his past and how he had to hide his mom’s infidelity from his father.

https://screenrant.com/suits-harvey-specter-loyalty-quote-mike-ross-betrayal-op-ed/