Once per character level. You can make an attempt to steal the heart of another NPC, abandoning your heart's former desire. Even if that NPC is romantically involved with someone else.
Roll 1d20 plus your current romance score with the desired NPC, plus one ability score modifier (you decide which attribute to woo) against your ally who must also roll 1d20 plus current romance score with the same NPC.
The higher dice result wins that NPC's affection and heart. The winner moves up in one relationship tier, while the loser goes down one tier. Consequently, the loser may attempt to win through the same method during the next game session or win back the heart through the deceiving heart method.
Decide to pursue another who is not involved with anyone.
You leave things amicably with your former relationship and make known your intentions to another.
Your campaign trait is replaced with another that is associated to the new NPC. You may roll twice, rather than once, when improving your romance score in order to make up for lost time and lost connection.
Act dishonestly in order to gain the advantage by influencing another's heart.
Each time you are able to influence your relationship, you may secretly influence another.
If you are able to skillfully ply your deceitful tricks through stealth, bluff, intimidate, diplomacy, and sense motive rolls, you might be able to gain more than one boon.