Romantic love and suffering

There comes a time in most people's life when they start to really like a person and this is where I want to begin. This feeling that arises when you think of this person , where does it comes from, is it being self inflicted from a lack of love or do they see themselves in another? What's more important for me at least in the mean time is how to cope with these feeling in an intelligent way. There will be times when the person does something that will give you a sense of suffering in your life. This suffering isn't created by the other person but of your own will. Let this person be themselves and don't bet your satisfaction on them because when you don't see what you want to see, suffering will flourish in your mind.