Answer:
This is a tough question and a question that gets thrown around a lot. Obviously when you love someone you want to tell them, but finding if you truly love them is the hardest part. Love is when you have the person constantly in your mind and you think about them in every situation. Love is willing to do anything for this person and you only want to make them happy. You truly love someone when you keep thinking about them and you put them before you. Living without the person is not a possibility. True love is when you want to make your lover happy way before you make yourself happy.
When you have these feelings and you know you are going to be with the person for a very long time, that is when you go some place romantic and you say those three words, I love you.
But remember, when you are dating someone, love may take a long time to develop. Do not panic and do not let anyone pressure you into saying it.