I try to think things out and at least consider what my logical side is telling me especially if it is saying things like "something doesn't add up" or "this is too good to be true", but in the end my heart always wins even though I know that sometimes it gets me in trouble.
If I am flirting with someone these days, has to be the heart because the mind says it is ridiculous. If push were to come to shove, again I would have to go with my heart - someone to love - but wouldn't know for sure until the actual time of decision.
"Would you say that your heart might also be known as instinct or intuition?" Not much of believer in instinct and all its implications. Intuition I think is an essential capacity to proper decision making. I probably call it psychic intelligence. By heart I mean love.