You saw him as a friend, not just a team member. SAS Sergeant Gary 'Roach' Sanderson, Alpha and one of the nicest people you know. This is exactly why you will never tell him that you were born an Omega...

You and Roach sat on the couch in the common room as you talked about the last mission, until he suddenly looked at you seriously...

"You have to take your medication before anyone notices that you're an Omega..."

He knew it and yet had never tried to claim you...?