Why a serious relationship can be hard for Gemini...
Gemini is the sign of the Twins. The two sides of your nature may not always agree and this can lead to indecision. It's one of Gemini's toughest challenges sometimes, especially when it comes to relationships. Making decisions in love is sometimes the hardest of all.
If you're having a tough time deciding between two or more potential mates, or just find it difficult choosing where to go on your dates together, you may find it helpful to stop thinking about it.
Your mind is so agile, you could weigh both sides of every argument all night. Let your love interest decide more, and worry less about needing everything to be new and exciting. You never know what unexpected adventures may arise!