Love is a sickness without nikah. If nikah is not possible, then either you break with that person or you be patient until you may perform nikah. But in the meantime, you should stay away from all communications and meeting with that person. In fact the more communication, the more feelings will grow. So if nikah is not possible now, then cut all communications from him/her until Allah Ta`ala may open way for both of you. In the mean time, keep fast consecutively to repulse carnal impulsions.