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This is extremely ignorant, her age isn't the issue.
If you aren't willing to say that her age is an issue, then I will propose that her handling of this situation is.
People have relationships all the time that flourish despite not being together or talking constantly; 10-30 minutes of a wait is not the end of the world, and to think that it is is an unhealthy standpoint to have when she can have a life on her own and needs to think that she can. If she cannot live without him, this is not a problem with him, this a problem of the handling of distance (figurative, not literal).
I say that she is 13, that she may not have this relationship because of the treatment of the situation. You may say you know her relationship, but it does not change that this is a clingy approach to have to any relationship and insistence of "I'm 13 and we're mature for our age" will not erase that.
If anything, what should be worked on is individuality, because you are your own person and can thrive without him or a relationship. Less than half an hour is not the end of the world nor is it going to kill you, and I would not doubt if, someday, he became suffocated by the expectations.
These are realistic things to be worried about.
I do understand that 30 minutes is not the end of the world, nor will it kill me. It just feels a bit lonely, but now that I understand the situation better, It doesn't seem as long. That is what this forum was made for, not to bicker with the maker and/or her cousin. I would insist that you please leave, because, in all honesty, this is a waste of both of our times and we could be doing much better things than bickering on the internet. This goes for you too, Megan. Thank you for defending me, but it's all done now. My problem has been solved.