Friendship after marriage is there such a thing?

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I was with my ex husband for 9 years ( we started dating when I was 14) we stayed together with no break ups for the whole 9 years. I am now 24 he is 26. We had two beautiful babies together. However we drifted out of that teenage love and into reality and realized that we were better apart. We have a excellent friendship and get along very well. My ex and his fiancee and their baby and My boyfriend and his kids and then mine and my exs kids all hang out together. I actually watch my ex and his fiancees daughter while they work. We eat dinner together at times. I have so many people look at me strange because of the nature of our relationship. We were once married and he has moved on ( and so have I) yet we all hang out. I will sit and talk to his finacee for hours on end. Is it really that odd. What do you all think?