Random headcannons about Doofenshmirtz' feelings about the divorce
-He still gets flustered thinking about her sometimes but he's too stubborn to let Charlene to know that.
-If someone was to ask if he thinks Charlene is hot he'll yell at you "OF COURSE SHE'S HOT WHAT KIND OF QUESTION IS THAT!? ANYONE WITH EYES SHOULD KNOW THAT!!" or if he's less defensive he'll just say "Yeah, she's way out of my league I still don't know why she even married me."
-He met Perry while he was still emotionally recovering from his divorce but Perry actually doesn't know that.
-Doofenshmirtz refuses to give details to Perry about his marriage or divorce with Charlene. If Perry gets curious he just tells him "There's nothing to say about it, we were married, we wanted different things, we divorced. What else am I supposed to say??"
There's obviously more nuance and details to that but Doofenshmirtz decided this is the information he's going to gatekeep from Perry the Platypus.
-He swears he's completely over Charlene and that he's not upset about it anymore but then then the next day something reminds him of their relationship and he breaks down into tears. It's kinda pathetic.
-He kept his wedding ring. He swears he'll sell it one day but he gets too emotional when he even thinks about doing it.
-He learns from Charlene that she does actually think about him sometimes and wonders if he's doing okay. And he responds with, "That's . . ." *was about to say something else* "a waste of time. Why. I- that's- you really don't need to think about me like that."
-He doesn't talk to other divorced men who are open about being divorced because he swears all they ever do is complain about their ex wife and he thinks it's cringe and he's too bisexual for that straight nonsense.
-Doofenshmirtz was actually terrified of having co-custody over Vanessa because he's so scared of becoming his own Dad (or Mother.) But he turned out okay.