New Chapters are so good

Maya is his dad genes!!

I hope I'm not reading too much into this, but Nemu seemed too preoccupied in the physical facet of their relationship. Like he began doubting Maya when Maya couldn't get it up. And the first thing he did after that emotionally charged confession scene was "doing it with Maya"

He didn't jealous like most ukes in other mangas. Not when Maya was going to ditch hom to save Okino (thank goodness Ruka stepped in and even though I think he intervened more for Kutani's sake). He was sort of jealous about Ruka, but only got really wavering when __Maya__ called him boring and was less receptive to physical relations, I think (so not about Ruka per se).

Even when he's spilling his guts to Okino, it's only about the physical side of the relationship 100% poor Okino getting an earful.

Is this because subconsciously Nemu equated him being blackmailed and raped by Maya (physical relationship) to gauge his appeal?

Or is this just guys? They're more worried about not being able to get their partner to get it up rather than suspect emotional cheating.

Do I even make sense?

I would like to address some of your points, if not all.

On the aspect of "Nemu seemed too preoccupied in the physical facet of their relationship", Nemu already explained during his conversation with Okino why he finds it strange that Maya couldn't get it up. Ever since the beginning of this manga, we've seen Maya get overly excited to have sex with Nemu. He wants to have sex in every opportunity he gets, thus; Maya's gloomy behavior and his inability to get it up after Nemu's advances (normally, this would rile Maya up and would literally have sex with Nemu IMMEDIATELY) would expectedly worry Nemu.

"He didn't jealous like most ukes in other mangas. Not when Maya was going to ditch hom to save Okino" I beg to disagree. Okino has become Nemu's best friend and has supported him emotionally, especially when Nemu got insecure because of Ruka (remember when Nemu blew up and cried inconsolably because he got kissed by Naoya after Maya told him to be careful, in addition to being insecure with Ruka plus Maya telling him that he is boring?) Nemu trusts Okino that he will not (cannot.. LOL) betray him by stealing/seducing Maya and he trusts and knows that Maya will never like Okino romantically. So, what's there to be jealous about? Nemu is quite mature in this aspect. He doesn't get jealous unlike some of the immature ukes in other mangas who would rather have their seme cling to them and disregard friendships and whatnot.

"He was sort of jealous about Ruka" He was jealous about Ruka (but I would rather believe that he was insecure that Maya would come to love Ruka and leave him especially when Maya said that Nemu is boring) because Maya keeps on talking about Ruka, happily talking rather. Nemu is bound to get jealous because who would want to hear a lover talk excitedly about another person and praises this person to no end?

If you have time, you can reread the previous chapters in order to understand the current development of this manga and the relationships of the character with each other.