You soon will be, trust yourself, what past stay in the past, it's your choice either you want to make it as a memory or an endless dream.
At this point am unsure about a lot of things and it breaks my heart
It's ok, not relationship work out well in the end, cause thing like this also have moral.
but how do I know if I should continue or break off?
It's mostly depend on feeling, relationship also goes both way, meaning both of you should try your hardest to make thing work, not one person alone. If you both really want each other back then it's to you, if not then your not meant for each other.