Yes these spells do work. However, before you try spellcasting I recommend you learn and master the basics of spellcasting (I.e. meditation, visualization, grounding).
Also, I recommend that if you try these spells have a specific intent in mind. Love and break up spells are not something to be messed with, if you love someone try asking them out first before trying magic, and it really isn't your right to break up a perfectly happy couple for whatever reason.
However, if you decide to do it anyway that's your choice, good luck:)