I'm sorry for not being a team player on {project}.
I've realized that while I prefer to work alone, there are many benefits to teamwork. It was great being able to bounce ideas off of {coworker}. And I enjoyed {portion of project}. Where it all broke down was when {collaboration element}.
After reflecting on my group performance, I realize now that I was too focused on {minutiae/maintaining control/my own ego/etc.}. Please know that I'm addressing these deficiencies within myself and am committed to excellence in our next team project.
Thank you for the opportunity to be part of this team and to experience the value of truly being a team player.
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Index of letter of apology templates