If your girlfriend wants kids and you don't, tell her the truth soon and in plain words, after you work out whether your answer is "never" or "not now", because those are very different sentences to hear. Then the two of you find out whether her wish and your no can share one life. Sometimes they can, and sometimes the honest result is that the relationship has to end.

Work out what your no actually means

A man who says "my girlfriend wants kids but I don't" often has not checked what he means. Some men mean never. Some mean not at this income, not in this city, not with this job. Some mean they are scared and have never said so out loud.

Psychotherapist Michele Paiva warns against treating "not now" or "as of now, no" as if it meant "never." If you let her believe your no is soft when it is hard, you mislead her. If you call it hard when it is really a worry about money, you close a door you have not looked behind.

Sit with the question alone first. Picture yourself in ten years with no children, then with one. Notice which picture brings relief and which brings dread.

Tell her early and say it plainly

Once you know your answer, say it. Do not wait for a perfect moment and do not hint.

A plain version sounds like this: "I want to be honest about something. When I picture my future, I don't see kids in it. I know that matters to you, and I would rather you hear it from me now than find out later."

Say it kindly, but do not dress it up. "Maybe someday" and "we'll see" feel gentle and do real damage, because she will plan a life around a maybe you do not intend to honor.

a dating coach teaches that a man's talk about the future tells a woman what relationship he has in mind, and that she tends to follow the direction he leads. That works against you here. If you make plans for years ahead, talk about moving in, or smile warmly when she mentions a baby name, your silence reads as a yes. Her picture of the future comes partly from what you leave uncorrected.

Ask what sits behind her wish, and behind yours

Wanting children is rarely one simple thing. For her it may be about family, about time, or about a picture of Sunday mornings. Ask her, and listen without arguing.

Therapist Tina Tessina says to learn the specific concern behind each stance. It might be money, timing or family. That applies to you as well. If your reason is that you never want the responsibility, that is a settled answer. If your reason is that you are afraid of becoming your father, that is a fear, and fears can be talked through even when they do not disappear.

Stephanie Cox, a counselor writing in Psychology Today, recommends small, ongoing talks instead of one heavy one. Put each person's feelings, timing and fears on the table. She writes that finding the disagreement means the talks are on the right track, and that the two of you are a team, not opponents.

Do not give in to keep her

The most tempting move is to say yes so the argument ends. Do not do it.

Cox warns, from her work with couples, that the partner who does not want a child should be wary of giving in without first discussing his concerns. She writes that couples who disagreed and had a child anyway faced greater struggles and dissatisfaction. It matches common sense. A child is not something you can try for a month and return.

The reverse holds too. Do not push her to say she doesn't want children just to shrink the conflict. Agreement she pretends to is not agreement.

Agree on a time to revisit it

If your answer is unsure, you can set a point to come back to it. Counselor Jenna Riemersma suggests agreeing on a timeline to revisit the topic, and says a partner does not have to stay if the other will not follow through.

Make the timeline real. Name a month, and name what each of you will do before then: she thinks about whether she could be happy without children, and you look at your fear honestly. If the date comes and you still cannot move, that is an answer, and she is owed it. Do not use the date to stall.

When the answer stays no

Sometimes neither of you moves. Psychologist Nicole Martinez makes the hard point: if one partner wants children and cannot picture a fulfilling life without them, the relationship may not suit that person.

The Gottman Institute says most relationship conflict comes from lasting differences. It adds that unmanaged ones can harden into gridlock and distance.

That is the general picture. In your case, if you are honest and she is honest and the gap is real, ending things is not cruelty. Staying while she waits for a change you do not expect is the worse choice for both of you. A clean ending now leaves her free to find a man who wants the same life, and it leaves you free to be with a woman who does not need you to become someone else.