How can you tell if you are falling in love with someone?

One can tell if they are falling in love with someone in a number of ways. If you find yourself longing to see, hear, or be with that person, that could be one indication. If you don't see them for a while and in that period miss being with them, this could also be an indication. If you attempt to busy yourself with other activities, yet still find yourself wanting to be with that person, you may be falling in love with them. Then when you are around that person, if you constantly feel happy in their presence, and tend to do things to please them without thinking, this could suggest that you are falling in love with them.