it is a single, attached thing...

When your single, you seek for more friends and soon... a soul mate
When your attached, you seek for a/more friends

So what is similar?
to be honest none... Why? good question

though both still seek to know more friends or hanging out with old friends..
But attached, seek for friends who he/she hope that no one will hit on them or trying to woo them...

whereas, single seek for friends as long your easy to talk with and able to hit or woo on people...

BUT... may not apply too all but Libra i guess... hahaha