Can you use your college education of psychology to your advantage when dealing with your gf or bf?

Companies hire Psych majors all the time to help with mediation and leadership training. Very useful degree

people in general. i knew that degree would come in handy. LOL

Yes of course and especially so in the area of faulty reasoning, misleading or unsound argument.

Tons of guys are grooming and gaslighting women with their psychology on the daily.
Some people are just perpetually driven and rewarded by a life of narcissistic objectification.
Even people on here have been subjected or perpetuated such manipulation.
It's not necessarily a bad thing either, I would imagine it makes stronger people.
But as much as one may know about human nature, it's really just the tip of the iceberg of rationalisation. People are unpredictable.

Yes I don't have a degree but I use psychology on ppl inadvertently somewhat often

It's useful in all areas of life.