Help with BF plzzzzz?

i need help with my ex. well i dumped him like 4 months maybe 3 ago. we never talked texted hang out it was like we didn't no each other. i gave him lots of warning. i finally just said i think we should be friends. he said ok ur right and stuff. he still liked me. and so later a couple weeks ago he texted me hey do u want to get back together. at that time was shocked then my izzy ( friend ) was like what and took it and was like ...... i asked him r we gonna talk and hang out. he says yes. then i text back and say yes. so we talk. then is texting him. when i woke up in the moring i felt like i didnt know how i felt bout him and couple days later i just texted him say i dont know if this is going to work and said i just really think we should be friends. and i said so can we please be just friends. he was ok but i could tell was upset i felt bad now im here on face book and see his pro. i dont know what to do i think hes still upset.