My ex gives me too much stress!!?

[Priya]

I am a 22 years old girl. 4 years back i have been in love with my schoolmate. He used to tell me even he had feelings for me but he never made me feel the same. At the beginning we were happy. The problem started when both of us were into different places for studies. And then he started ignoring me, my calls, my msgs and whenever he used to talk, it was about some other girls in his college. I was really depressed. He used to say he is busy and I find him on facebook commenting on his friends posts and all. It continued for 2 years and i finally gave up loving him after 2 years of complete stress and depression. i liked some other guy who loves me so much. And then my school mate has come back again and he wants me to be in relationship again. I never felt the same with him again. I said the same thing to him. Now i really dont have any feelings on my schoolmate. I dont want to talk to him anymore. But these days I talk to him as a good friend with the fear that he may go into depression and spoil his career. One of his friends pleaded me to do so. But this guy he is trying to put limits to my interests. He tells me what to do and what not to do. If I go online, he just starts putting satires. He says me not to waste time and go and study. I already told him I don’t love him anymore and I like somebody in my college. Then he did the most stupid thing. He has created a fake account and started talking to this other guy whom I like. He comes and tells me what type of a person he is. He says that this guy is just using me in the name of love. I was very stressed and frustrated. He has hurt me and insulted me infront of his friends, when I loved him to the core. I have given him a number of chances in 2 years. And after 2 years of complete tears and sleepless nights, I have moved on and he comes and tells me how to live my life X(
And the worst thing is I can’t say him how stressed and irritated he is making me feel, because if I do so , he would behave so depressed that I myself feel lost and depressed and very much stressed . I don’t want to be atleast his friend now. But I am talking to him only due to the fear that he might go into depression and spoil his career.
On the other side i have hurt the other guy soo much However we are together again We like talking to each other very much. Sometimes we fight over small things and however we be normal again. We are something more than friends and less than lovers . I love being with this guy
My problem is my ex. Please suggest me how to let him know how stressed he is making me feel and how can he stop bothering me and think about his future… please