If you think there's any chance that one of these other relationships might end up being a replacement for your husband. You know, emotional entangment, sexual compatibility and likely the desire to cohabitate then leave now. It's not fair to your husband to keep him around until someone more compatible for you comes along. If you are committed to maintaining your relationship with your husband I would say that you still have a lot of work to do to mend what you have. You've self described your relationship as broken which, to me, means either put a lot of work into fixing it or putting a lot of work into seperating amicably so that you can coparent your children in the best way possible.
Everything will be ok in the end. If it's not ok it's not the end.