I always loved the character of Pam and Victoria Principal's interpretation, but at the end of the 1982-1983 season can say that if I were Bobby Ewing would have tired of her a long time ago !
Any excuse was good to complain and argue with her husband. The list of these excuses (some of them justified) would be really very long ...
Or her repeated leaving of him, for numerous, creaky reasons -- even taking the baby Bobby bought for her as she goes -- over the same old "family issues." Not that I ever felt that bad for smug Bobby (who looks, to me, like a firer -- I wonder how the Ewing Oil secretarial pool downstairs felt about him) but Pam's frequent running out on him seemed excessive.
It's been said before that Pam was the character least-defined on DALLAS, the one whose motives were adjustable based on what the writers needed her to do. Patrick later referred to Pam as "pig-stick nutty," but I prefer to blame the neurofibromatosis Pam didn't know she had until after her hellish crash into that tanker and would eventually take her life!
Krystle ran off (sometimes for good cause) on Blake multiple times, too. So watch your gold-diggers -- they need our support. And they usually wind up miscarrying, depressed, and in lengthy comas wrapped in muslin and on an I.V. drip.