As someone who hasn't been in love, Therese isn't qualified to judge whether or not Richard is in love with her. But the way he acts as their relationship falls apart makes us think that he doesn't love her.

This is Therese speaking to Richard after he basically says the same thing to her. They're around the same age, late teens to early twenties. Does anyone really know who they are at that age?

Richard believes in weird lesbian magic, it seems. Although he has heard of lesbians in society, he doesn't believe they're a normal part of society, and he clearly thinks Therese has been tricked if she's now a part of the lesbian crew.