Nice question. Thanks for your question. It happens with everyone. I know from my own experience that it is difficult to be sure that you are in love. 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. Love is not like an idea with a definition or like a physical phenomenon on that can be measured. Love is a matter of choice. And so, to use a quotation from Saint Bonaventure : Love is its own measure and standard. There are, however, certain practical points to consider : Is it my friend that I love or is it the feeling of love that I love? We are so often overwhelmed by the extraordinary feeling that accompanies love that we may forget about the other person. A good question to ask would do I want to love  her? Since true love is not so much a feeling as it is a decision, a choice, we have to will to love.Finally, love needs the response of the other to actually exist. We cannot speak of love if it is not reciprocated.If you are not sure of the others feelings, don’t remain in doubt. Find a good moment to speak together and find out the feelings and attitudes of the other. 

Thanks for your questions and thanks you again.