Scout
Jeremy knew he loved you when he saw how well you and his mother got along. Jeremy's mother is and always will be the most important woman in his life and having a girlfriend who got along with his mother meant a lot to him. Just seeing you and his mother get along so well, he knew you were a woman he would love forever.
Pyro
Phoenix knew he loved you when he showed you his face for the first time and you weren't disgusted or scared of his burns scars. He was sure you would find him ugly but you smiled at him cupping his cheeks and telling him how beautiful he was and his scars didn't change how you felt about him. Hearing you say that just warmed Phoenix's heart.
Medic
Ludwig knew he loved you when he saw how well you were with his doves, especially how well you were with Archimedes. Ludwig's doves were one of the few things in this world that Ludwig loved. He would give them so much love and care and seeing someone give them that same level of love and care, just makes Ludwig's heart skip a beat.
Sniper
Mundy knew he loved you the first time he took you camping. You guys had so much fun together. At the end of the day, the two of you sat outside his van and you were looking up at the shining stars in the sky. Mundy wasn't looking at the stars at all, Mundy kept his eyes on you. He couldn't believe he was sitting next to the most beautiful woman in the world and he knew he was falling for you hard.
Spy
Jacques knew he loved you when you were hanging out at your place and you fell asleep in his lap. Jacques couldn't help but smile looking at you as you peacefully slept. You just looked so beautiful, Jacques loved every little detail on your body. Jacques never thought he would ever fall in love again, but looking down at you, he knew you were the woman for him.