What’s like going on in that picture why is Wife Ingo so mad, does Mermet not know about ddau ingo tendencies?
Hello anon!! So I haven't finished the post about ddIngo and ddEmmet yet. It's getting there - I went through all my chats with @glassesblu to compile all the info on it. It's 10 pages of content to sort through! o(*°▽°*)o
So, the context for ddIngo himself is kind of missing in this answer, because I want to save that for when I make the post! But don't worry, you guys will learn about him in depth soon.
As for the comic! This is gonna get long. ヾ(•ω•`)o
So, the condensed answer is that no, Mermmet does not know about ddIngo's tendencies. Mermmet is oblivious to many things, and will often brush off things he doesn't understand as 'humans just being humans.' This is *much* of the problem that Wife Ingo had with him in their life together. Mermmet would respond to his concerns or objections by saying he was being silly, or completely misinterpreting that *he* was the one causing the distress Wife Ingo felt. Mermmet had to get back on the right track while on the Train too, as a note.
Besides that, they did not get much time together in their reincarnation life - Mermmet returned to the train far sooner than ddIngo (and Wife Ingo, even though the timelines are nebulous at best). In addition to not spending much time with ddIngo in their reincarnation life, ddIngo was surprisingly appropriate to him in that life. The easiest explanation for this is that ddIngo had his connection severed from ddEmmet, but not reestablished with any other Emmet, including Mermmet. Therefore, he had no memories or particular personality instincts from his previous life; so he was sort of a 'blank slate' Ingo for their shared life.
As for why Wife Ingo is so mad! Welp, most of it has to do with how he's finally reconciling with Mermmet over how he was treated in their life together. He fought to get Mermmet to treat him affectionately while on the train; but now, ddIngo is treating Mermmet very possessively. He can tell ddIngo is mostly doing it to get a reaction out of him, and he's *heard* from a few sources that ddIngo is a dangerous and cruel version from a different universe. So some of it is anger at ddIngo using Mermmet to mess with him, some of it is jealousy at ddIngo touching *his* Emmet, and some of it is just frustration that he's even feeling these things in the first place.