how can we be sure that we love someone?

I have fallen in-love twice. First with a childhood friend and the last time was with my husband. I had other relationships but aside from the two, I just felt so ordinarily attached with those guys. I knew it was love that I felt with my lover who became my husband 2 years ago. I do miss him every time he's away and couldn't wait for our next meeting. I'm excited whenever he comes to our house, even a single thing or effort he does would mean a lot to me. I long for his nearness most of the time. Maybe those were the signs I've seen during that time and until now, I still feel the same way. When we got married, my love for him grows stronger and hotter.

Some say that loving someone means to be happy for that someone's even if he/she is belong to other's arms. I would say that when you're in love with someone you loose, to a certain extent, the notion of belonging to yourself. You feel a strange thirst like never before, a strange need to have her/him in your arms. When you're in love, the notions of "me" and "you" cease to exist, as in your thoughts there would be only "us". There is a way on how to be sure that you're in love with someone... despite the fact that each of us has his/her own system of values. You're in love, you'll just feel it and no questions will come into your mind. You won't know why, because love comes without a reason, but you'll know.