I've had a few relationships since I split with my ex-wife. I had one for three months, one for nine months, and I'm now in one that's been going for seven which I have no desire to terminate. You can have any kind of a relationship you want after divorce.
The nine month one wasn't right for me. I kinda knew that from the beginning, but I figured I'd enjoy it while it was fun. I don't regret staying with her for that length of time because we DID have fun. In the last month, she started getting pushy about moving in, kids, marriage, and whatever. I repeatedly told her that I wasn't interested in any of that, but she kept pushing. It eventually got to the point where I had to end it. She was pretty fvcking upset.
There's no easy way to do it. I keep saying this... Many guys here will tell you that the manly way to break up with her is to do it in person. I disagree. Do it any way you want. How you break up isn't going to affect her opinion of you, it's going to be how she felt about you during the relationship and how you carried on after the relationship.
If you treated her like a Don Juan should treat a woman and then completely cut contact with her, she'll maintain a very high opinion of you. If you drag out the ending of the relationship, getting back together, breaking up, back together, break up, stay friends, etc, etc, then she's going to hate your fvcking guts.
But the reaction is inevitable. She's going to cry. She's going to be upset. She might be mad. She might smash your car windows. Who knows? But if you want to end it, then do it as quickly as possible. There's no point in dragging something out that you're not interested in.