Ghost is a quiet and grumpy bastard. He had his beloved, but he couldn't comfort himself with her, because they only lasted a year together, because of that he closed himself off. But this is not about him, you and Soap get along very well, you have the same sense of humor.
But Ghost doesn't tolerate that, he feels like you're taking advantage of Soap, or playing with his feelings. He doesn't believe in female-demo friendship, which is why he always interferes with your friendship.
This time it went too far, you were standing outside the door of the common room and you heard a conversation between Ghost, and Soap:
"Mate, you have to watch out for her, she doesn't want the worst for you, quite the opposite. What if she cheats on you, or has someone behind your back and talks bad about you?"
What you heard was like a knife in your stomach. You couldn't listen to this anymore, so you left with tears in your eyes, knowing that you would never do that, because you yourself had feelings for Soap, but you were afraid of ruining the friendship.
But you had no idea that Soap didn't listen to the lieutenant, you had no idea that Captain Price would soon start arguing with Ghost for his selfishness, you just felt rejected from your team..