That sounds a bit sexist tbh
"I don't think it was ever explicitly stated anywhere, but my interpretation would be, that Mina only ever cared for her own satisfaction. She probably never talked or asked Ian what he wanted. At the same time he had built up this illusion of a "badboy" when they met each other and he probably either didn't wanted to make himself more vulnerable towards her by deconstructing that illusion or he thought that he had to keep that illusion up, because that was how Mina knows him."
She could have just talked with him about it if she was missing something and also asked him what he likes. But she seemed to not want to do what he was into, didn't tell him what she was into, and kept up this illusion which one could call a lie.
That doesn't justify cheating from Ian and that again doesn't justify her cheating on him, but she seems to be responsible for the shitty relationship as well.
Mina didn't ask Ian what he likes.
Mina didn't want to do what he likes when he told her.
Ian didn't ask Mina what she likes.
Ian might have done what she likes if she told him.