Nah, that is gaslighting. She, who says doesn't have feelings for him, was told to marry him in part because he said can't be happy with anyone else. Meguro's whole deal was that she didn't really understood love very well until she met and dated this guy, yet here she aiding in robbing her friend of that opportunity.Reading it through a second time after reading the previous comments, I don't see what the problem is. There is no gaslighting, in fact everyone is acknowledging and supportive of Ricchan's differences. Since Waku understands her, he wants to her to know he loves that side of her that tries despite her being different. Waku making the marriage proposal is his way of making them both happy, by allowing themselves to still be their own person without compromise and still be friends and family. If anything Ricchan is the one being inconsiderate by trying to force the breakup with Waku without considering his feelings.
Seriously, all that was missing was one of them telling her she "will learn to love him".
What be should had done was be a big boy, respect her decision and if anything, just say that he would always wait for her.