It really depends on what you want to do after. If you have plans to fo to Japan and
live there, like I did at one point (and I am still wondering yet), you better take some class. Don't be afraid of going through the basics again, it will serve you for the rest of your life.
If you do not have any plan like that, than, I cannot say. Since Japanese doesn't have much use outside Japan, if you don't have any plan to live there, even if only for a few years, I hardly see any purpose of going through the assholes of classes, except for fun. It would be like learning English and then never intend to use it. Sounds a bit silly. Still, if you have a specific purpose, you still can do it, and after, you can still decide whether you want to persue things a little further or not.
As for the girlfriend, I don't know, my only girlfriends were French ones
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