I don't know what to do.

My boyfriend(now my ex) cheated on me 3 weeks ago. He confessed. I broke up with him. It's been a roller coaster ride. I have been drinking to forget about the pain. But last week i was being okay. I seldom drink and just do school work. We had a mutual friend and that friend of ours informed him that i have been drinking. Now my ex was so worried that he texts me everytime. Yes still really love him and miss him. He was asking for some time for us to talk but i always decline thinking that i may break down. I just can't. It really hurts. But yesterday we talked and talked and end up crying. The both of us. He was being honest to me of what happened. He said his sorry was not enough and he's asking for a second chance. He said that he wouldn't do it again. And i was like crying really hard because i was thinking of all the memories we had. I'm in a 50/50 situation. I don't really know. I know that his sorry was real but i just can't accept it at the moment. We ended up crying the whole night. I can't say anything. What can i do?