Nope. If Nemu were a victim of abuse I'm sure people would be pointing fingers wondering how he could trust a guy who abused him even though he loved him (doesn't matter whether or not he actually would love him, just that he would think he does). Too many people literally have good reason to not trust someone so saying trust is necessary makes it sound like they're not worthy of love, purely because of circumstances outside of their control.
Healthy conversations (not communication, which sounds more like a demand than something that is actually healthy) are a necessity to make a loving relationship work.
Ruka is the problem because he actively tried to drive a wedge between Nemugasa and Maya because he could use their weak point for that reason. All the other hurdles were not actively made by someone else. T.
I wouldn’t say all other hurdles because the father was a big breaking point as well momentarily before he “gave up” if you will. But there will always be that driving point of their parents eventually seeking to breakup their taboo relationship if it gets more attention in the future.
And I disagree that “trust is necessary makes it sound like they’re unworthy of love” because I’m not arguing that trust and love are interchangeable. I think both will benefit them, and can.

I'm sorry, but that guy literally did nothing except be a twat. He comes across as someone without regard for other's feelings, only what he feels is beneficial for himself, which makes sense for his backstory just a bit. The words he said to Nemu were harsh, but he wasn't lying. I'm just saying, Nemu would have gotten insecure anyone. I'm disappointed in the finger pointing comments. Lets not forget that neither of them had really been in healthy relationships up until this point, so it's a miracle their love has gotten them this far.
This segment is just proof that a relationship doesn't always run on pure love. It takes some trust, some self-fulfillment, building a life of yours WITH your partner but also AROUND their life sometimes. If it wasn't Ruka, it would be someone else. Let's say Ruka mysteriously moves out of the area, or country, and Maya still has his job. There would still be the problems of coordinating meeting up together. You see? Ruka is just a symptom of the condition that their relationship is burning out and they can't just keep running on love and fucks forever.
This isn't even a bad thing, and Nemu does have valid feelings, as well as Maya. They just need to figure out how to be independent people again and reach that point of co-existing together while loving each other. It's going to take some work, but if it works out, their relationship will only get stronger. So don't point a finger at either of them. Jealousy happens, and you can't really prevent it, but how you deal with it can make or break a relationship.
As for the "Dump Ruka", it's never really fair to put someone's job over them. That's his literal source of income and he's struggling to make ends meet. I would understand if Maya continues to work with Ruka. I think the story will write him out somehow, but realistically you have to trust your partner.
:) I look forward to their growth.
I really like how mature Nemu's Friend's Boyfriend (I'm shit with names) is. His insight was really good, and I like how he said he had experience now even though it didn't work on for him (9.2).