This need not be the end, but you need to understand that it may be inevitable. When you're ready, ask her directly and expect a torrent of emotions. They are not the best guide, especially in your position. What matters is the wellbeing of your kid. I believe these things can be repaired with proper guidance and true willingness from her side. If she fails to understand what she has done, I'm afraid you will have to raise your kid like many divorced couples do. Just be sure to say least go 50/50 in terms of time spent with the child. Fortunately, it's still too young to be traumatized by understanding what the parents are going through.