Major guy problems!!!!?

so i dated a guy for over a year.. then i found out that 3 other guys wanted to be with me. and i was getting bored of my boyfriend anyway he was very clingy and always wanted to know everything i was doing every second and it just seemed like we were just drifting apart. he felt like my father. so i told him i wanted to take a break so i could see if this is what i really wanted. but we promised each other that we would tell each other who we would flirt with and we wouldn't actually do anything with anyone else. then after a couple of weeks i found out that he was going behind my back and asking girls for naked pictures and asking them to strip on webcam for him. i guess i wouldn't cared as much if he wasn't being so shady about it but he had everything private so we got in a huge fight and broke up. we decided to be just friends but hes still being clingy and its driving me absolutely crazy. i don't know what to do! hes constantly texting me waking me up every morning asking me who im going to hangout with that day and whenever i don't answer his texts he goes crazy and is like "your with this guy aren't you." he gets mad at me yet we're not dating anymore so i don't see why hes being like this. and he told me i can talk to him about anything and he asks me if ive kissed other guys and when i don't tell him he gets mad and if i do he gets even madder. i really don't know what to do. i still care about him and the worst part is over i guess i just need my space. i thought being just friends would fix it but i was totally wrong i don't know what to do !