how do you tell someone who is already fragile that the way they behave toward you hurts like hell

i literally just want this person to stop saying ‘no I can’t but I swear you’re important to me’ and then play with three or four other people. but never me. i want not to feel like i’m being lied to. i promise i’m not fucking guilting you but you ARE HURTING ME.

stop hurting me please ijust want the truth