What's the difference between main squeeze and girlfriend?

[ORDINARYGIRL92]

guys be like they got a main squeeze and a girlfriend

[Orion]

I would presume the difference is in the mind of the person using the term first and foremost. Otherwise I would suppose the difference if I were to assume one would be one being not exclusive; "main" possibly defining her as "the more important one of several potentials", and "girlfriend" showing a high level of commitment.

Of course that could be over thinking it and it could just be that she is his Girlfriend and he's just not prepared to call her that, or it's just simply a term of endearment that he chose to use.