Not sure if this really qualifies as a "Green Flag" (maybe chartreuse?), but through my "many" years of dating and heartache and restlessness, I've noticed a few commonalities separating the 'fleeting feelings of infatuation'-type of relationships from the rare few that, depending on life circumstances, could be wearing the ring that's wrapped around my wife's finger. These aren't jaw-dropping insights, mind you, but simply character traits that have gone a long way in establishing a firm and steady bedrock for not merely a healthy romance, but an enduring and deeply fulfilling relationship.
>sense of humor
>predilection for rational, empathetic debate
>ambition
>willing to be spontaneous
>>open-minded
...and that's about it really. Again, nothing shocking or revelatory, but nevertheless the traits which constitute the basic, key ingredients for my lil' everlasting romance stew <3