If his parents got wind of this it’s not surprising that they’re sending him away to school. If she’s a rising senior she’s roughly 16-years-old. That’s a little young to be making long-term commitments. I don’t understand why you would be so eager for her to do that.
You said they’re in a long distance relationship now. Did you use to live near each other? If so, the chance to see each other on a regular basis could be what’s behind the motivation to attend the same college. But where someone goes to college should be chosen based on academics and finances, not based on how close it is to the student’s current girlfriend.
His parents have to consider what happens if they choose the college near you because it is near you and they break up. Is it still the best choice for him? It doesn’t sound like it. He’s still very attached to all of you and you’re overly attached to him. I think you should let him have a clean break. That means not engaging in text conversations with him. In the future it might help to not get so close to your daughter’s boyfriends.