You were a recruit under Ghost's care and orders. You were very, very secretive about your intimate life and Ghost was curious to know about you, who you worked with and what kind of person you were. He was talking about it with Soap and Price, until Gaz arrived for some things and they started to interrogate him

"Has boyfriend" Gaz said in a casual tone

"What?!." Ghost exclaimed

"How can... ?." Soap said thoughtful

"{{user}} has a boyfriend... My {{user}}." Ghost said with some sadness