I cheated on my girlfriend

Nobody writes for this position. Everything about infidelity is addressed to the person it was done to, which leaves you searching for something that is not going to open by telling you what you already know about yourself.

Should you tell her?

This is almost always the actual question, and being unmarried changes the calculation in ways worth naming.

There is no shared mortgage, no legal process, no children. That cuts both ways. It means telling her may simply end the relationship, quickly and cleanly, with none of the structural reasons that keep married couples in the room long enough to work through it. It also means she has every practical ability to leave, which is precisely why she is entitled to the information on which to decide.

For telling. She is in a relationship she does not have the facts about, and deciding on her behalf that she does not need them is a form of control. There may be a health consideration, and that one is not optional. Carrying it silently also has a cost, usually showing up as tension you cannot account for. And if she finds out later, from anyone other than you, the concealment becomes the larger betrayal.

Against. Some relationships do not survive being told, and a confession made mainly to stop your own discomfort is a poor reason to end one. It is also irreversible.

Three things usually decide it. Has it genuinely stopped. Has the contact stopped with it. And are you weighing something up, or looking for someone to authorise a decision you have already made.

The relief belongs to you

Confession makes the person confessing feel lighter almost immediately. It makes the person hearing it feel considerably worse. If the primary function is unloading, then the telling is one more thing you did for yourself, and it will be received that way whatever you intended.

A reliable test is what you expect to happen next. If some part of you is waiting for reassurance, or a reasonable period after which this is behind you, or acknowledgement that owning up took something, then relief is driving the decision rather than honesty.

If you do tell her, do it once and in full. Partial disclosure, with more surfacing over weeks as she asks better questions, is worse than the original act. It removes any possibility of the ground staying still, and that is what makes recovery impossible.

Knowing why, without offering it as a defence

The reasons matter to you and they are not currency to spend on her.

The reasons are usually less dramatic than the guilt suggests. Alcohol and opportunity together. A stretch where the relationship had gone flat and neither of you had said so, which is ordinary and is addressable long before it gets here. Wanting to feel like someone you have not been lately. Being unable to end something directly and creating a situation that ends it for you, which is more common than people admit and worth recognising if it fits.

None of that excuses anything, and offered as an explanation in the moment it will land as blame. But a man who thinks it simply happened has no idea what to steer clear of, and that is how it becomes a pattern rather than an event.

If she already knows

Then the question is what repair looks like, and it asks more of you than an apology.

It means answering the same questions well past the point where it stops being bearable, without any signal that she ought to be finished. Ending the contact visibly rather than describing it as ended. Accepting that she may be fine for two weeks and then wrecked by something small, and that this is the normal shape of it.

Above all it means giving up the timeline. Deciding privately that enough time has passed is the single most common reason recovery stalls, and it is usually the unfaithful partner who does it. Where you both want to try, structured work exists largely to hold that boundary.

Be honest about what you are trying to keep. Rebuilding something that was good is different from avoiding the loss of something that was not, and only one of those works.

The part with nobody to say it to

Most men in this position have told no one. Friends will either wave it away or take a view that never softens, and neither response is any use.

Guilt with nowhere to go does not stay put. It turns into irritability, drinking, distance, being harder to be around, and she notices all of it and reads it as something else. Several men describe the weeks of carrying it as worse than the conversation that ended them.

My job here is not to reach a verdict on your character. It is to help you decide what happens next and understand how you arrived at it, which is the harder and more useful piece of work. If getting the words out is the obstacle, say that first and we will start there.