Befriending an ex

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I was dating a guy in May. After 3 weeks he started accusing me of falling in love with him, said I was not his girlfriend etc etc while he was the one who was chasing me for almost 2 months before we dated. However, after our relationship ended, he still did not like to see me hanging out with my guy friends and tried to befriend them himself. It was always going back and fourth, our strange "relationship" after we stopped dating. Sometimes he tells me he's not the good guy for me that I should find someone else but when I did date someone else, he was rather sad about it and just disappeared. When I stopped seeing the other guy, he'd come around but then says he cannot promise the "boyfriend" thing. I dont get him. He seems hurt to see me with someone else yet doesn't want a relationship. I know he's been very hurt in the past but still. I am still friends with his friends who are coming more and more forward with me, they all like me. I want to still be friends with him, he's fun to hang out with and it would stop the awkwardness if I were to be with his friends and if he were to turn up then. He did propose to his friend (without letting me know) that he wants me to play in his band. I learnt it from one of his friends. Then I met him at his work place and he told me that he wants me to play in his band. But now he's just gone comepletely quiet. I don't know if it's because he saw me with my new boyfriend who I'm in a serious relationship with, heard it from his friends... I know that during this time, he dated a girl for only four days then she told him it's not right. What should I do? I still want to be friends with him but I dont get the signals that he's sending out.