Am not able to cope up

I've been ditched out of a relationship recently, one year when we were near n together, everything seemed good, but I had become a lot possessive and kinda toxic in between because i have been cheated twice before, n so I don't have a good mental state. I tried to explain this to him but at last he just said he doesn't feel anything because am being so paranoid. N am shattered again because I really thought this would work out, but it didn't, all on a sudden he just withdrew saying that he had been feeling this from a long time but he never expressed it before, I feel I was just a time pass for him now n that he was never serious about us. He never took stand for me verbally in front of the friend's group, though his actions before were for me in my favour, but sometimes u just want to listen when someone takes a stand for you...that never happened... But even though he is friendly with all other people now more of girls... Idk what i must do to overcome this... I can't be crying n suffering like this a lot, it's taking tolls on my mental, physical and emotional health, but there's nothing am able to do or decide now...even if I decide something, it'll be for sometime n then it'll change. My emotions are taking over me. Moreover there is no one i can trust here for this, everyone is just busy in their works n almost everyone has a double faced nature which is suffocating me more. Idk what will or what would help me come out of it... But i really want to be fine n happy like I used to be. I've lost all hopes in being together with someone anymore...n I've become more paranoid now...