apple watch 8 will not pair with phone. it goes through loop of connecting and says it is connected, and then it disconnects with watch. will not pair manually either

Hi Brenda gb, We appreciate you reaching out to us. We understand that you are experiencing issues pairing your Apple Watch and iPhone.

We’d like to gather additional details that may help us be in a better position to assist you. It looks like you came from the article below. Have you had the chance to try all the steps in that article, and make sure that your Apple Watch is up to date before pairing it to your iPhone?

Update your Apple Watch

If yes, we recommend that you also check for a software update on your iPhone.

While it isn't inherently assured that an update will resolve the issue, updating to the latest software version for your device can help isolate potential software issues. 

Kindly secure a backup and update.

How to back up your iPhone, iPad, and iPod touch

Update your iPhone, iPad, or iPod touch

Take care!