Here's the thing though. Takt seems to want girls that seem to be interest in riku. Both girls were clearly interested in him. Dumb dumb kept going on , on about takt, so because he never made a move on the one girl she got interested, and tried to move on. When she mentioned Riku to takt then, and only then did Takt make a move on her. Same with Minase. Throughout the manga you get a look at Takts cold eyes. The fucker is not a good friend. He acts like a good friend while in front of Riku, but behind his back it's different. Also there's no way she's giving takt head, and no way he's not doing her anal at the very least.
All of that is true, but none of it changes anything I said.
We as the readers know that Takt has issues, but Riku doesn't. From Riku's perspective Takt is his best friend and Minase, his girlfriend, is being unfaithful to him.
From Riku's perspective, Takt has done nothing but treat him well, even coming to check up on him when he was sick. However, he still remains silent about Minase's behaviour.
Furthermore, the fact that Riku is still willing to make a move on Minase even though, from his perspective, Takt has done absolutely nothing wrong makes him just as shitty as everyone else in this story. Possibly even worse.
We as the readers may know that Riku's actions are justified because of Takt's issues, but Riku doesn't. He thinks he's doing something wrong to his best friend, but he's doing it anyway because he's thinking with is dick.
I definitely wouldn't want a friend like Takt, but I wouldn't want a friend like Riku either.