Some people tend towards selflessness. Others are naturally more selfish; the needs of others are less important to them. Some may not warm to such a character, and that is fine too. While objectively selflessness is a moral virtue, no one has every virtue and everyone is still capable of having a normal relationship.
However, some people have a tendency towards narcissism. This is where someone’s own needs push out all consideration for the needs of others. Often they crave approval and attention, and struggle greatly to accept criticism. Such people can struggle to participate in a healthy relationship.
Being married to such a person is difficult, though not impossible. If someone is a full narcissist, they are suffering from a serious mental illness. That means that unless they receive intensive treatment they will be manipulative at best and evil at worst. If your date is showing signs of significant selfishness, you need to take the time to learn the signs of a narcissistic tendency.
