Hopelessly devoted to my ex. Help?):?

[Alexis]

Earlier today, I was on twitter (like always ). Long story short a friend of mines pissed me off. Without thinking I post a tweet saying "I don't wanna talk to U for as long as I live". Unfortunately the post had linked to my fb timeline. There were several friends on my fb asking if I was okay. I told em i was fine. About an hr later my ex who broke up with me a month ago sent me a msg on fb and a txt asking if I was okay. I didn't respond. Then he kept texting me asking the same thing 15mins later. I still didn't respond. I wasn't trying to be rude or childish, but I was still hurt from our break up. He also wants us to be bestfriends from before our relationship, but for some sad reason, I just don't want to cause I'm still very much in love with him, but he got with someone else a week later AFTER our breakup. He says that he'll always be there and care for me always like before, but my heart won't seem to take his word. But now, I'm having 2nd thoughts if I should txt him back so that he'll stop worrying, but then again I don't want to talk to him for awhile at least till Im completely healed from our breakup and can finally talk to him without feeling a bit emotional. What I don't seem to understand is why does he still care for me if we're not together and why does he still need me in life if he has a GF? It confuses me. Plus I want to tell him how I really feel, but I don't want him to pity nor feel sorry for me which hurts me inside even more. I'm being strong and patching up the wounds that he left, but I find myself crying at times and it sucks...any advice? Please no cruel or rude comments please ):