Actually, yes, the individual texts are there in the Cloud - at least for a while, depending on provider. They are encrypted so that in theory, they are safe and and privately stored.
180 days is the storage time listed in the article below, which also says that all it takes for LE to get them is a subpoena.
No Warrant, No Problem: How the Government Can Get Your Digital Data — ProPublica
So yep, with or without phone, text messages are available for 180 days to LE. Must be a fascinating morass in this case.
Facebook messages are also available by subpoena, but I don't know how long they keep them.
Perhaps one of our lawyers will weigh in, but I believe these subpoenas are only available to LE and in criminal cases.