I (26f) have anxiety/depression and my bf (31m) doesn't have either and I have episodes overthinking our relationship. Sometimes I get stuck in my head and I close myself off because I don't want him to see me like that. I'm afraid it's harming our relationship (though he's very supportive) but I'm afraid if I am open about it that he will think I'm a mess and scare him away.  Any advice for something similar?