Do you consider serial monogamists unstable?

While they don't cheat while in a relationship, they can keep accumulating up to 10-12 (or more) temporary live-in partners during the years. They are usually short-lived relationships, never making it past the "falling in love (experiencing the highs) stage, stuck at the romantic stage but never staying with one of them, never teaching the actually mature love stage, committing.

They live together with all those people but in the end, it's always ending in break-ups. Do you consider them unstable people?

Do you consider serial monogamists unstable?
Post Opinion