Some people require variety to survive.
When everything is perfect by theory, everyone should enjoy it but its only a theory. For example in most cases stubborness is the accessory of a stable person - but if the person who stubbornly wants variety, she will never change her ever-changing theory.
Everyone's belief is different. Some people want to settle with someone else when they are young to explore life together, the journey may be somehow stricted (choices to be based on common decision and comprimising differences) but it is good to know there is a companion to cheer you up along the way. On the other hand, some people want to settle down after they experienced everything life offers, perhaps loney but they can go as far as they can without worrying too much about whom is tagging along. Wicked belongs to the later one.
Relationshop is sweet and satisfing the sweet tooth, it can also make you diabetic. Wicked consider her life to be still scattered, being able to make improvement is only a small step to reach her less-than-normal life goal. Perhaps how much a person wants to get into a relationship is in relation to how much they want to comparmise their life goal; in combination to how much a person want to explore life as part of a duo.
Assuming how similar you and your partner is, there would be no case of identitical thinking, as the result comparimise is needed.
If you want to run wild and you can not trust yourself neither, or you are dying for some "Me" time every week. Maybe a part time lover is a choice - you don't want to use other people's passion only for the time you have, and you don't want to give up what is fabulous to you, if someone wants to part time with you, then it may just be a choice to go for. NB: be prepared for the man to have other part time lovers, don't forget save sex!
Perhaps there is a warlock somewhere who can run with Wicked, perhaps he will be there to kiss Wicked's all personalities, then she may be able to settle down with him in their alternative sugar-free sweetness. She may change her stubborn idea of relationship. Perhaps.