My girlfriend said that our horoscopes are not compatible.

You can tell her that if you are not together because of the mismatch of constellations, then the world will be less fun and less miracle. Love is supposed to go through multiple tests, and then it will be interesting to get the right result. If you live in peace all your life, it will be dull happiness from the objective point of view of others, but from your own point of view, you will find that your love has no memories. So, there is no need to care about this bullshit. Love should not be measured by anything, so planned love is much less fun.