Your OC has not been in the right mental space, for whatever the reason may be. This has lead to isolation from others and putting on a facade when others are around, but secretly, they are crying themselves to sleep every night. They do not want to burden their significant other with their problems, so they attempt to avoid them as much as possible. But, what if the love interest found out about the mental state of your OC?
This scenario serves as a sort of comfort corner with the love interest character.
Just remember that it's okay, to not be okay.