I don't think we ever stop growing. I know we never stop learning. If he's going to act this way, then you figure out how you can act as if you were feeling better and completely confident in this relationship. Maybe act as if he only has a 10 min. window to talk to you because of the phone company.
Until H cheats on you AND you know it beyond a doubt, you are posititive, you can't think that he has. And you CERTAINLY cannot treat him like he may have. Think about your girls. Are they the same? Do they do everything the EXACT same way? Do they only eat the exact same food, wear the exact same clothes....etc? Basically, there's nothing you can do but work yourself up into a tizzy over this one, so let it go and assume your H would not cheat on you. You can't punish him because his brother is a jerk. Yes, he's on vacation. Yes, it sucks you are at home with the kids and working. Yes, it sucks he hasn't called you when he said he would. Let it all go. You can't do ANYTHING about any of it, except let it go. You have made the decision to let him call you from now on, so let him. Remember, he does miss you and his girls. But think of how much more he misses his father when he's not with him. And now he's with his father and his brother.....that's great, be happy for him. This might help you feel better. H is with his brother and his father....the two men that have always been around for as long as he can remember. The sad part about getting older is that those relationships, established when you're a kid....well, they become more distant because you grow up, you meet new friends that are more on your level with more of your interests, so you pull away from your parents and become more social. Then you get even older, go to school maybe, get married, have your own kids and things just change with your parents. You have a new focus. And this is how it's supposed to be. Now, he's with his two childhood best friends (that's probably how he sees them) and they have memories together that are personal, unique and because of that very very special. Let him enjoy this time. Relax. He loves you.