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I don't think that when you give up on 3D, it would indicate that you are committed to your beloved partner yet. Giving up on 3D is probably when you suddenly realized that reality is one ugly world to live in and you would prefer an idealized version of your own world in 2D form. Hating on 3D has nothing to do whether you truly fell in love with the right person or not.
You know you're committed to your beloved, when you believe that you're really committed to your beloved. You can't just say 'oh I have strong feelings for her, but I am not sure if I am actually attracted to her' since your uncertainty could probably imply that you might not be attached to her in a long run.
The best thing to do is just wait and see if you truly meet the one that gives you that certain spark and in the end you would go 'Yes, I will forever be committed to this beautiful woman, since she is certainly the one for me and I think there are no women who is exactly like her for eternity'.
I will just leave you with this.
'Don't look for love, let love find you. That's why it's called falling in love, you don't force yourself to fall, you just do.'