
I understood right: the uke was searching for a wife? Why does seme said to him "Aren't you getting married?"?

In many asian countries people (mostly older generations) equate a happy life with getting married, having children, and finding a job with stable income. Therefore, the seme is asking y the uke isnt trying to accomplish these ideal conditions and become happy. If he continues his current relationship with the seme without getting married he maybe thinking that neither of them will end up living happy lives.

I have a question: there http://iweb6.mangapicgallery.com/imgfiles/fushidara_na_hanatsumi_otoko/7/030.png is written that Ayumi-san has no siblings, so he is not Kotaru's uncle, right? Someone could explain how they are relatives?
well, Midori's friend was right when he said that Midori isn't a thing. I don't like when someone calls his lover "thing", I don't see anything romantic in statement like that. Still I think that Sensei is very obsessed with Midori, I don't know if this is love, why he can't just say "I love you". Probably he has some issue and he think that when he is forceful (maybe in sensei's mind he think to be very passionate) he shows how much he loves him. Btw I think that Midori likes it, I can feel S vibes from him. Right now is not a healthy relationship but I hope in some developement
P.S. i don't think Midori did something wrong by coming with his friend, sensei's reaction was too much. In which way did Midori betray his trust? The only reason sensei could be disappointed could have been that he thought Midori was coming to see him by his will, and he was happy but then found out that he wasn't alone and gone mad (and that doesn't justify his behaviour), probably in this three weeks he wanted that Midori contacted him, infact he was looking at his cell, he wanted Midori to do the first step and when he thought he did, he wasn't alone. He didn't understand Midori's intention. So I think that in his very (unhealthy) way sensei cares about Midori, but he has to change his attitude towards the way he expresses his feelings.
Sorry for my english