I'm pretty sure I've never dated an ISFP, but I'd imagine I'd go nuts trying to not hurt feelings. Y'know what? I don't know if I've been friends with an ISFP irl before. I know I've hurt ESFP feelings completely unintentionally before. Didn't know it 'til a few weeks later too. Whoops.
I 65.63% E 34.38% S 68.75% N 31.25% T 87.1% F 12.9% P 66.67% J 33.33%