Yes, provided the spell works,you may have heartbreak... AGAIN.
However, please remember that it is also in a sense "playing with fire" when doing love spells. A lot of times people will tell you it is better to do one seeking/attracting a new lover, rather than on a specific person. Personally, I don't have just one preference and I won't tell you what to do. The downfall in all of this is free will (in your case). If you did the spell for him to return to you, then he has the choice to break up with you again, and vice-verse for you as well. Find out what went wrong before, and try not to do that again and make sure to have great communication as well! These are simple things that any relationship could thrive on without spell work. But now that the spell HAS worked, do your part by just maintaining and keeping up with the relationship. If you fear break up/heartbreak, then why do the spell? It's a risk you have to take boo.
Hope I helped! Blessed Be!