I'm in a bit of a dilemma and need help.

My wife and I separated/divorced a while ago. I'm not wanting to go into the details of the why other than to say abuse was a huge factor.

In a few weeks my 16 year old son will be visiting Mr and he wants to know why I initiated this. Frankly he is too young to know all the details. I want to protect him from that. The problem is that I've tried every subtle way to kind of talk around it but he said he wants answers.

I have no idea how to handle this and not burden or harm him with more information than he needs to know but while also trying to get him to "understand", at least a little bit, where I'm coming from.