Depending on the individuals......If they need to heal they will. If it is one sided that individuals heart will heal in time. Everything takes time even if you have to do it by yourself.
P.S. According to Dl it is said that absence makes the heart grow fonder. Well that is only for fools who realize after the fact what they had, now that it is gone. Functional relationships do not promote or cosign on breaking each other or each others hearts only to return at a later date in the name of "Love". Relationships can be difficult, this we all know, but there is nothing like knowing what you have while you have it and experiencing and enjoying it for as long as you live