<human>: Can you condense the text into a few key points?

My ex (Ben) and I broke up a year ago. We had been on/off for a long time and we had only stayed together because of our son (now 4). Finally, we realized it was never going to work so we broke up for good. We're still friends and see each other regularly with our son.

Recently, I started dating this guy (Adam). I've known him a long time, since college, which is also where I met Ben and they are friends. The thing with Adam and I has been quite casual and we have taken it slow. 

Now it has reached the stage where we both want to take it more seriously but I'm starting to feel a bit weird about the situation with Ben. Is it bad to date your ex's friend, especially when you have a child together? I really like Adam and it's nice to be in a happy relationship but I don't want to ruin the relationship with my child's father. I'm not sure I would like one of my friend's dating my ex, so maybe I'm answering my own question. 

Does anyone else have any thoughts on this? Is it a bad idea?
<bot>: I've started dating a friend of my ex, don't know if this is a bad idea. Made more complicated because my ex and I have a child