Paul was repentant... Trump is not...why is that so hard to understand?
How do you deem him “not.” Some of this criterion might be a Pharisee-esque attitude on your part, Churchianity rather than Christianity.
This is not Israel where one would “divorce foreign wives.” Limiting the harm by not breaking the latest promise, while making amends if necessary to the rest (and none seem to be asking amends) would seem in order.