Because he’s getting divorced, he’s still legally, financially and emotionally completing his relationship with his ex.
Moving in with him over-involves you in his life and makes it impossible to set healthy boundaries.
Set a boundary that you need him to proceed with his divorce in order to be involved with him.
If he stalls or makes excuses, step back from dating him until he takes the necessary steps.
There is no distinction between platonic contacts and ones that are romantic or sexual, although from a practical standpoint, the romantic/sexual relationships are the ones that draw scrutiny and cause complications.