You can mention it to her, but I wouldn't get too worried. At 13, a boy is VERY immature -- he probably hasn't even THOUGHT about the relation thing. He's just starting to physically mature, and I'm sure he's a bit confused about all that is happening to him. Boys don't mature as quickly as girls do -- this sounds more like a "puppy love" thing that youngsters feel. I don't see anything abnormal about it.
Try not to worry too much. He'll find a new "girlfriend" soon. God bless & take care.
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