Yeah, apparently the Bert/Gerard fall out was over Gerard going sober (Bert didn't like that). And after Gerard stopped doing drugs they stopped talking.
As for the whole Lyn Z thing we don't know for sure if they're dating but it's possible.
Yes, Mikey is known to stick forks in toasters. I don't know what happened between Bert and Gerard, some arguement. And Gerard did break up with Eliza, and is now dating Lyn-Z, the bassist of the band Mindless Self Indulgence.
Ugh, the Mikey thing is so cliche, but yes, it supposedly happened once.
And second, no one really knows but the end of their friendship was centered around Gerard and Bert, who used to be really good friends. No one knows what happened though. Neither like to talk about it.
And third, yes, he was engaged to Eliza at one point, but they broke it off.
As for the whole Lyn Z thing we don't know for sure if they're dating but it's possible.