@HOOfan_1 thing is though is that she was the one who initiated and progressed the relationship for most of this manga. She used his stress and current life situation in a way to get him to like her. To him she was the only one who would satay with him and said she loved him. She also showed physical displays of affection, for example, throwing the water in that one woman's face.
I'm sure anyone in his position would hold on to that single thread of Love and affection.
I don't blame him, not even in the park, since she was the one who initiated that as well.
She needs to stand up to her mother and the public to explain everything, but she doesn't. The only person who "loved" him is just staring at him with a blank expression.