My take on frerard:
So, Frank meets Jamia, and he falls in love with Jamia. Later, Frank meets Gerard, and falls in love with Gerard. He genuinely loves both people, so he can't really choose who he loves more. But neither Gerard nor Jamia are interested in a polyamory relationship.
Eventually Gerard gets fed up with it, forces Frank to choose Jamia, and gets a girlfriend.
Frank then proposes to Jamia.
But Frank just can't get over his feelings for Gerard, he still lives Gerard, so he slowly eases his way back into Gerard's life. Gerard realizes just how much he missed Frank because of this, and dumps said girlfriend.
Frank and Gerard become extremely close again, before Gerard is like: "Frank. Stop. We made an agreement, you stay with Jamia. We can't keep doing this." But Frank still refuses to give up.
Later Gerard meets Lindsey, a cool artist who he falls for, and who also falls for him.
Yet, still, Frank is Pursuing him. He decides that he has enough, knowing that he can't be with someone who won't fully reciprocate his love, and thus the frerard fight happens.
Gerard in a frenzy, marries Lindsey, hurting Frank in the process, because Frank realizes that he truly can no longer be with Gerard.
Frank then marries Jamia, writes all of those songs and poems about Gerard, and then everything is good.
And of course, the guys still love their wives, but they also still have feelings for each other.
Then Gee breaks the band up, Frank and Gerard stop talking, before getting back into contact and maintaining a strong friendship. : )