I'm afraid to buy a new bike because my old bike will feel jealous. So, I will have to ride both bikes equally.

Inevetably I'll prefer one bike over the other. The less favored bike will figure this out on the basis of how I act on the road, and bring up the fact that I'm just "not into it anymore". When really I'm just exhausted from riding 10 times per week. Then one day when I want to just go home and take a nap, I'll notice and my favorite bike is missing her handle bars and the deraileur will be mashed in.

I have a hard time even going to the LBS anymore...