We can still be friends, right?

Anyone that knows me, knows that i'm pretty upfront, so here goes:

Ummm, actually no we can't!! This has often been a question asked after a breakup, and unless the relationship ended on good terms, i.e. we just weren't compatible, then no we can't be friends. Most of my break ups have not been on good terms. I had the one guy that I dated off and on for about 2.5 years, he flies me to Atlanta to propose to me in front of his parents, I actually broke up with him the day before he proposed, and told him that i wouldn't tell his parents and I'd play the role until after we got back home, just so he could save face. Well, the next day me him and his parents went to this very nice restaurant in Atlanta called Bones, he proposed to me and i accepted. We went back and forth for a while, before finally ending our relationship for good in February. He was married and expecting a child 8 months later with the girl I suspected him cheating with, he told me she was gay. Next relationship: dude seemed to have his thing together, good job, nice house, nice car. He was very respectful and patient with me...at first. Then girls started telling me that they were dating him, but they hadn't seen or heard from him in about 2 months(the amount of time we had been together) so my thought was well if you haven't seen or heard from him in 2 months, move on, he obviously has. Then I got a phone call from the girl who told me she was pregnant by him, I asked her how far along she was, ok it happened before me and him got together, I asked him about it, because he never mentioned it to me, his response "that bitch fucked everybody, that ain't my kid" and then she disappeared, meaning I never heard anything from or about her again. fast forward approximately 8 months, I notice formula on top of his refrigerator and a diapers in his bedroom. I ask him about it, oh yeah she had the baby, so i ask if he took a paternity test, he said no. I see a picture of this kid...she is his twin, no wonder he didn't take a paternity test!!! But honestly i could have dealt with that, before this happened I was open to dating men with kids. With him it was an accumulation of things, like he had sex with anything or anyone....let it marinate...yeah anyone. So when they asked me if we can still be friends, my answer is hell no...a friend wouldn't do these types of things, a friend would try there hardest not to hurt you, and a friend would always consider your feelings...I'm not bitter and i don't think every man is a dog, but like i said unless the breakup is on good terms why should we still be friends??