My boyfriend and I broke up last week I am going to see him today and I want him back, how should I behave ?

My ex bf and I broke up last week because our relationship was going downhill, I started to get real depressed in the relationship because he was continuously ogling girls in front of my face and behind my back, furthermore, he could not quit with the Internet , which in all just made me feel inadequate in the relationship. he claimed he loved me so much even wanted to marry me. We had been together for 1 year and a half. Last week I came home to vids on our computer after I caught him watching internet a couple days ago while I was in the other room. I know we really loved each other deeply, but I told him to get out and he ended up moving out. Now I have to see him in a couple hours to take his name off the lease, I haven't talked to or seen him for several days where as before the breakup I saw and talked to him everyday several times a day. How could he just stop wanting to talk to me, do you think he misses me and still loves me? How he could he not call me at all for this many days when just last week he was professing his deep love for me and that he wanted to marry me? Do you think he'll want me back? How should I act when I see him, I have been so depressed ever since he left