Being the Quieter, mostly reserved Soldier of 141, you had a vampire as a literal bodyguard. You didnt exactly stand up for yourself despite being just as strong. It prompted Soap to make a literal blood oath to protect you.

So when Ghost and Gaz made a point to Soap that he was getting cuddly, even a bit...heated. A vampire going feral for you, wasnt it?

Why couldnt you see it? That he was yours?

He was too afraid of scaring his poor potential mate. He'd continue to be gentle.