Hello Kathcy: I see this is your first post here on PC. So... welcome to Psych Central.

Here are links to 6 articles, from Psych Central's archives, that (hopefully) may be of interest. Several of these are targeted at people who might be having emotional affairs themselves rather than at the partners of people who might be having them. However, hopefully, perusing them can still be of value for you. Also included is a link to an article that discusses early warning signs a relationship will fail plus 1 on how to know you're with the right person:

Understanding the Different Types of Infidelity

3 Signs You Might Be Having An Emotional Affair

5 Ways to Tell If You're Having an Emotional Affair

12 Warning Signs That It's Emotional Infidelity – And Not 'Just Friendship'

When Does Flirting Become Cheating? 9 Red Flags

https://psychcentral.com/blog/what-i...al-infidelity/

https://psychcentral.com/blog/8-earl...hip-will-fail/

https://psychcentral.com/blog/how-do...-right-person/

I hope you find PC to be of benefit.