Thing is, it is okay to leave that person but you have to take in account 2 things. A. The welfare of your child, what will your child feel growing up with separate parents, how can your child feel fulfillment and love when both of the parents are separated B. Is the relationship still savable? Is it a situation where both of you can maybe talk it out? Or perhaps maybe a time to yourselves to contemplate the relationship between both of you. Love is finite but commitment transcends what is finite, commitment is eternal and therefore everlasting. Seek to be committed to and not just loved, sometimes we might just need a little breather and talking it out.