I have suspected/possible BPD and I’m attached to my S/O. When his tone is slightly off or less enthusiastic, I either assume he’s upset or upset at me, or even doesn’t love me anymore. My way of thinking, when it is normally not like this, is emotional and black-and-white, so I can go from “I’m so happy, he loves me” (white) to “he hates me and doesn’t love me anymore, I’m so angry at everything!” (black) to white again! I’m trying to learn that things can be both or that “he is frustrated, but he does love me still, it’s more gray.”