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1. They believe in each other

2.They both had people they loved die

3. He helped her conquer her fears

4.He notices the little things about her

5.They know when something is wrong with each other

6. They care about each other

7. "Do whatever you want to me but leave him alone"

8. He teases her

9. They worry about each other

10. He runs to her before anyone else

11. Barry's the reason she wants to stay at Star labs

12. She thinks he deserves happiness

13. The way they look at each other

14. She's his felicity

15. He sees Caitlin in his future no signs of Iris

16. They make each other smile

17. Iris can sense some tension between them

18. He's happy when she's happy

19. They have undeniable chemistry

20. Speed and cold are opposite but opposites attract