When a woman you are seeing reacts to a situation emotionally. Is this a sign of intense emotional investment or a sign of emotional instability?

For example, a girl blowing up about you seeing another woman or being with another woman vs a calm talk about the situation.

In the past I've seen women blow up, calm down and apologize, blow up again at certain uncomfortable points in the conversation and then resume calm demeanor.

I've also experienced women that can confront difficult situations and make an attempt to talk about them without all the drama.

I understand women react emotionally and not logically, and I understand people are different. I'm just curious if a stronger emotional reaction = stronger emotional investment or if a stronger emotional reaction = less self control and emotional instability.