I'm looking for some thing just like [ Love on Hold /Why Are You So Kind to Everyone Except Me] and the relationship aspect . like the seme and uke like each other for a long time but they don't confess there feeling to the other.
I haven’t read the story you’re referencing but this is a long time (seemingly) unrequited love story: https://www.mangago.me/read-manga/omega_complex_1/
mutual pinning dummies:
https://www.mangago.me/home/mangalist/2513247/
the FL (gray hair) is a female knight(sword master) that dies and came back to change her and the princes fate. the ML is the princes knight(sword master) and a duke(I think), and he fought the Fl in her first life.
this one maybe? https://www.mangago.me/read-manga/sigrid/
https://ncode.syosetu.com/n7529gb/