does anyone know how to stop a new favorite person from forming lmao

so long story short, I have bpd and I have this issue where I will get extremely attached to a person, even if I barely know them, and it becomes obsessive.

normally its been kept relatively in check, but for the past couple of months its been a cycle of A) talking to a person I think is decent looking maybe once, B) thinking im in love with them and then C) getting depressed/upset when they do anything out of the expectation I made up about them in my head, later to find a new target.

for anyone else with BPD, are there any tips that have been helpful for you, I feel so bad every time this happens lmao