Probably the biggest frustration most people have is wanting or expecting their mate to behave a certain way. The only person you can control is yourself.
We are who we are and people change when THEY want to.
It's very important to know who you are, what you want, and need in a mate (prior) to becoming involved with someone. It's very frustrating trying to "change water into wine" or learn how to "fit square pegs into round holes." We are far better off getting with someone who (already) is what we want. For example if one would like their mate to be more affectionate then the question arises as to why they did not select an affectionate mate to begin with. Each of us chooses our own friends, lovers, and spouse. There's no getting around that. All relationships are "at will" and no one is "stuck" with anyone. One major key to having a happy relationship is being with someone who "naturally agrees" with you on the major things in life and shares the same goals for the relationship.