Jack G: You take the most out of everything and always try new things. You're not afraid to fail and he has always admired that. You encouraged him to do the same and you were one of his biggest inspirations. He knows you're the kind of person he wants to spend rest of his life with.
Jack J: You two were at a grocery store. You noticed an old woman reaching for something pretty high and immediately ran there to help her. Jack didn't see it until he heard the woman thank you. The smile on her face made Jack smile even wider. He loved you and how you didn't doubt even for a second before helping anyone.
Sammy: He was in an important meeting and you were waiting for him outside. You were wasting time on your phone when you felt him watching you through the glass wall. He looked a bit unsure so you smiled widely at him hoping to encourage him. That smile gave him so much confident and happiness and he knew for sure he loved you.
I kinda ran out of ideas on these ones but I hope you enjoy!