Wait Gaz flirting with you over comms- it started because you two were trying to make fun of Ghost and Soap, who basically fuck over the radio with everyone on it every mission.
"We're a team. I'll always come for you, Johnny." Gaz said in his best Ghost voice.
"Aye... a team..." Your Scottish accent made Soap scoff in offense. "You and me.... Lt... what if we kissed o'er behind those dead enemies..."
Then he calls you his wife. The context as to why is lost to time. Probably some joke about you bossing him around. You call him your husband back, like it was a challenge. It continues with playing this fun dance of back and forth, never doing anything concrete. No talk like that once the missions over.
"Gaz, I could really use some extra coverage, West wing."
"Heard. I'll be there soon, love. Got some dirty work ya need your husband to take care of?"
"Yup, just some dirty dishes. Get that handsome ass over quick, yeah?"
Graves cut in, his mic static snuffing out your rapport. "Y'know what they say, Garrick. Happy wife, happy life."
Almost in unison, you and Gaz replied, "Shut up, Graves."