You have two friends. A and B.
A met C and fell in love with each other, and off they go, a notification on facebook officiates everything.
Couples do become closer and closer, don't they?
So do them.
Lectures, outings, birthdays, everything.
So you are thinking the ones in a relationship deserves more private time with each other.It's understood.
You became closer with B, and by chatting and interactions and sharings, you guys are closer than ever. You share secrets, feelings and thoughts.
Until it came to a point where A discovered that you told something to B and not to him/her.
A is sad. Disappointed. Feeling ignored. And cried in front of C.
At that point of time, which you thought A wouldn't care about all this.

Hmm.
So maybe a weekend escape is necessary.

D says you cannot achieve any balance in between. Life isn't fair and you have to be inclined to a side.
E says why bother? Be firm with your choice.

And all of this happens when the sense of attachment come settles in. =/