If you feel she needs to call to talk to your children on the weekends you have them, then I think you can be strong because it is what is best for the kids, as long as you are doing it for them and not for you to talk.
With asking about the divorce, don't worry, everyone makes mistakes. Just get back on the horse and don't ask. Let her have a chance to miss you as a husband, and a father too because if that is how it start then that is great. The rest will come. At least she is complimenting you about being a great father.
Hang in there! I feel for you.
Me29 S3 H left 4/1/09 I file 8/2/10 Divorce final 5/17/11 1st http://www.tinyurl.com/25lhu52 2nd http://www.tinyurl.com/2c35ueg 3rd http://www.tinyurl.com/322yk89