I want a divorce but I'm too nice to break his heart...he wants to try and make it work.
Do you feel like you need a divorce to make a major life change?
Definitely.
It's okay to want a divorce. You shouldn't stay with your partner if you don't want to. It's best to make the decision carefully so you won't have regrets.
I feel like it'll hurt him, but I feel like a divorce is best.
You aren't obligated to stay with him. If you feel the relationship can no longer work, then get a divorce.