When I felt NRE (new relationship energy) in the past with my previous partner, I also wanted to spend as much time as possible with him. It was a whirlwind of awesomeness going on in my heart...but yes I can relate to that guilt. I made sure to give my primary partner lots of love and extra attention during that time. We had some of the most amazing sex and wonderful discussions and date nights. I think it's ikmportant when you're feeling NRE to realize how it may affect your other partner and focus on them as well.