Nothing. Its a difficult situation. You know shaq hi dawa to hakim Lukmaan ke paas bhi nahin thi. Possessivness is a way of demonstrating love but at the same time, it respresents sense of insecurity. So, one has to work on removing this sense of insecurity from his/her partner. Just show patience and make him/her feel that you love to receive his/her calls/missed calls but on the other side of the phone set you may not be at a comfortable situation to receive his/her calls. One must try to develop in his/her partner's mind that he/she trusts on him/her and she would be happy her feelings are reciprocated.