Things that make me feel like I am in love:
1) Poetry
2) Music/ghazals
3) Nature (water bodies, really)
I don't like the feeling of being in love with a person. I can love. It will take a lot of safety to allow myself to feel "in-love" with a person (maybe a signed contract intended to be for life). I can still think about a person first thing in the morning, and fall asleep thinking about them.