In order to change things up, you need to shake things up. One is you can't be a puppy dog. A puppy dog is nice and easy going and always available and asks the person to be with them and when the person can't, the puppy dog is disappointed but "OK" with that too.
To shake things up you do a makeover. I know you did one already a few years ago, but you need to get sexier and just different than however you are now so it's boom! an obvious change in his face.
Go to one of the stores where a young saleslady who knows what is in style can help you buy some hot items that would look hot on you and someone your age.
Show a little more skin than you usually do; maybe a v or boat neck, or bare back or sleeveless. Wear different fabrics, maybe a silky blouse or satiny camisoles. Different colors that flatter your skin tone more and make you "pop."
Go to a makeup counter and get a free makeover, watch how they apply it and buy the makeup.
Change your hair color or high light it. If it's long, cut it to a sexy shag. If it's short, grow it out.
Do not ever ever call him and when he calls you, don't pick up and get back to him a day later (unless it's urgent about your kids of course).
When you see him when he's picking up your son, always look amazing and be running out the door. When he asks where you're going, say, I'm just going to meet someone for something or something else equally vague.
Let him in the door of course and after a few weeks of this, have a vase of flowers sitting there so when he comes in and you're running out he's sees them.
Wear a perfume you like, if there was one you wore that he loved when you were first dating, all the better. Leave some lingering in the air just before he arrives (and you leave).
Don't ask him to do anything for you or be anywhere for you. When your next concert comes up don't mention it at all unless you can find a way to bring it up in context of why your kids can't see him that night.
