I started getting close to my colleague, everyone used to say that he is only using me for work. My attention for him used to uplift his ego and boost his confidence. I never listened to anyone and but noticed him getting over with everyone in his life one by one. I was very sure that i can never be the one but one fine day he just decided to maintain distance with me and then i realised that even i was treated the way he treated others. It has shaken my trust in relationships, though we were not in affair but very close that we used to share so many innate talks. What should I do?