There are many reasons why people who are extremely selfish cannot afford a marriage.
First of all, marriage is based on mutual respect and understanding, which requires both people to give and sacrifice together. If a person is extremely selfish and only cares about their own feelings and needs and does not consider the feelings and needs of the other person, then the marriage is likely not to last. Because marriage requires two people to work together to build a deep relationship and trust.
Second, extremely selfish people often lack compassion and empathy, and have difficulty understanding and experiencing the feelings of others. In marriage, this lack of empathy can lead to feelings of neglect, belittlement, or disrespect, which can lead to conflict and conflict.
Furthermore, extremely selfish people tend to only care about their own interests and are unwilling to make compromises or sacrifices for the sake of the other party. In marriage, both parties need to make frequent compromises and sacrifices in order to achieve common goals and aspirations. If a person is extremely selfish and only cares about their own interests and is not willing to make compromises or sacrifices for the other person, then the marriage is likely to be deadlocked.
Finally, extremely selfish people tend to be controlling and possessive, trying to control the actions and thoughts of the other person. In marriage, this behavior can cause the other person to feel constrained and suppressed, which in turn can lead to rebellion and resentment.