How can we be sure that we really love someone?

How can we be sure that we really love someone?
We know from experience that it is difficult to be sure. We do not always see clearly. It is not easy, in every case, to be sure of myself or my feelings and to have to depend on tangible proofs or signs.
do you think, caring for someone is enough reason that you really love him/her?

Sometimes, you will only know that you love someone when he/she is already out of your life. But most of the time, I believe that one is sure that he/she is in love.

If you are happy when you're together and even if you have problems both of you strongly believe that you can work it out despite your differences and if both of you meet halfway so that you can make ends meet.

There are a certain ways we should know if we love the one we are dating or not. If one is having a smooth relation and every thing is going on as per both of the partner's liking, this should indicate that there is love in between the two. But if the two concerned are not happy with each other then the matter is different.