Although this is a late reply, a snapshot of the lunar return and your natal would be needed. Some indications within the Lunar return would be 5th house action, highlighting your romance and fun. Usually Pluto in fifth -- a dramatic change in your love life. This paired with positive luminaries in the LR 7th house would mean it's not just a fling. For example, any time I've started a significant relationship with someone, I've had a Pluto in 5th, paired with a Venus in 7th (my natal fifth house ruler).