why would you assume that an rp partner playing with other people besides you means they secretly think you suck? do you get the same way if they play with different characters or thread a different ship out with someone else?

if i thread a ship with someone, we ain't married, i can thread with other people who play the same character if i feel like it and they can thread with other people who play my character too and nobody cares

if this kind of thing bothers you then you're blurring the ic/ooc divide and need to work on your insecurity and inappropriate possessiveness