What should I say to my ex-boyfriend?

My ex-boyfriend broke up with me about 4 months ago and i still have feelings for him. We just slowly drifted apart..? i [about 2 months ago] found out that he still talks about me through a good friend and that he regrets what he has done. The thing is, he isnt doing anything about it and it frustrates me. (for the guys, can you tell me why you wouldnt make a move after feeling regret?) My ex also knows that i still like him. A few days ago, i drank a little too much and i called him over the phone and totally forgot that he was on the line. i was yelling about him about how mad i am and not even knowing why he broke up with me. he hung up after my friend called him a p*ssy. I called him back to apologize after i was sober, and i told him that i wanted to talk to him in real life. How should i talk to him ? What do i even say... im actually just afraid of what will happen after i talk to him. I dont know if he still has those feelings for me either.