Bellamy - You always have to be touching each other in some way. You're connected at the hip and you're incredibly clingy to one another.
Finn - If you argue or fight its loud and obnoxious and sometimes includes people who want nothing to do with it.
Lincoln - You're constantly talking about each other to the point where it get on people's nerves
Jasper - You feel that you need the others approval for everything, and you both lose your sense of independence.
Monty - The two of you are jealous of everyone. It doesn't matter who, you just want to be the only ones in each other's lives.