I agree. Those times when he came to the apartment, Ulyana seemed anything but not sad or bored or even annoyed by his presence. She was always hugging him so for me something she has feelings for her boyfriend, if it were the other way she would never even let him in the house or at least she would be disinterested in him. It's a complicated situation that only Ulyana can resolve in one way or another. Of course a single Ulyana is another thing entirely but she has to choose whether to be single or not. After all, they can't all be like Masha who doesn't care about the consequences if she fucks with this or that man.