1. If that is the reality of the situation of course. What if I am more invested one? I know I am supposed to be indifferent but if I am not I will not make myself indiffrent just by repeating myself that I am. I dont believe in affirmations.
In this case, you should thank the girl for showing you what you need to see about yourself, forcing you to look at something you didn't want to look at. For being the trigger you needed at that moment to trigger you to go deeper and do more work on yourself.
Then you should take the hint and get back to work. Do your pushups.
I don't believe there is some finish line that you cross, where now you are indifferent and thats it, you're done. Its more like you feel indifferent, you don't get attached, but then some new girl/situation comes up and triggers you and you realize that you're not indifferent, and you do some more work. You do your work on the attachment, overcome it and now maybe you feel indifferent again for a longer time, maybe months, maybe years, but eventually something may trigger you again.
Even if nothing ever comes up again that triggers you and you
have reach the place of complete total 100% indifference, there's still nothing that announces that fact. Its just that you go longer and longer and nothing triggers your feelings of attachment. It doesn't mean something still can't - its just that it hasn't. The moment you announce "I have reached ultimate and complete indifference - I'm done, finished, I have arrived," is the moment your ego and your hubris sets you up for failure again, because now you're attached to the idea of being indifferent. You're not indifferent about your indifference.