As they say, there are two rules in improv: Never say no, and never ask why. When another actor asks 'Why?' or says no to something you're suggesting, then it's very clear that they're putting the onus on you, because they're not comfortable with it themselves.
I'm not really the type to wear my heart on my sleeve. I would let someone know if I liked them, but it takes a while for me to fall in love.