You are getting attracted. You think about him/her. You want to be with your object of love. You are showing all the signs of being in love. But is it love? Or is it infatuation that will go away after some time?
Let us examine this in little more detail. What is the difference between love and infatuation? The first difference is that infatuation is short lived. It disappears soon.
How will you test it? Think about all the qualities that are making you fall in this love.
Now think of another person. Imagine that the new candidate has all the qualities in greater measure. Think deeply and imagine as much as you can. Are you still in love, or you are shifting your allegiance to the new candidate?
Take another scenario. Imagine having a bad fight with your lover. Imagine of him/her calling you different names and arguing furiously with you. Are you still in love? Will you go back next day to them? Or you already hate them?
Take this test. After many years, your beloved is losing physical charm. Pick up photographs of some movie stars when they were young and compare with the way they look now. Do something similar with your lover. Are you still in love? Will you love them after so many years when they would have lost most of their physical charm?
Love is a feeling that lasts despite years. Love can take fights in its stride. Love cannot be easily defined, but in love you care for your beloved more than yourself. You become very selfless with your true sweetheart. Do you have that feeling? If yes, it is love. Otherwise you need to think more.