IR says in the interview that he and GGP were friends. He says that he hasn't talked to GGP "all winter" and obviously implies that that is a change from the norm. When a person says that someone that is/was a friend has "changed", that is usually a negative thing in the eyes of the person saying it, because it implies that the person is now different from the way they were when they became friends, when there was something that attracted the two to each other and made them want to be friends. He also states this in a way that sounded to me like it was either GGP's decision or that because IR decided to tell what is undoubtedly the most accurate version of events, which is an obvious conflict and problem that would not allow them to be friends any longer.
Why would GGP and IR not be able to be friends any longer, as a direct result of what happened on that trip, keeping in mind that it is most likely evolving into a murder investigation, with JM and VDK being named suspects? And, depending on whether or not LE believe that GGP's discrepancies are the result of "confusion" or not, if (when, I think..) charges are brought against the parents, it is very likely that GGP may also be charged with some sort of accessory/obstruction charge. I think the most likely reason they have not spoken all winter is that IR is telling a different story, one that implicates at least JM and VDK, and GGP isn't happy about it.
I think if he were talking about the way the public has treated him in a negative way, I don't think that "people change" would be the choice of words he'd use. In light of his correct use of the term, "skeptimistic", I believe he'd have been a bit more clear, if talking about the public, maybe saying that people's opinions of him changed without knowing the full story, which led to him being treated as someone who is guilty of something. And he never refers to any of the negative things that people said about him in the beginning, like, "Oh, IR is the mysterious friend.. he must be involved." Or that his privacy was invaded by people trying to dig up dirt on him. He doesn't say any of that, IIRC. He speaks about how his friendship with GGP "changed" and later stated that people "change" in the blink of any eye. And I cannot make the "until it's too late" fit in with him talking about how poorly the public has treated him either in person or on SM. What's it too late for? To reach 1000 Twitter followers? Too late he realized people have a negative view of him? Too late for what?
IMO, he really wants to tell his story, and is giving as much information as he can while still following his attorney and LE's instructions. And his story is obviously one that casts, if not direct blame, but at least a negative light on JM and VDK, and one that GGP doesn't support him telling.