Did you really need to Do everything with your significant other? Is it really a sign of love if you can't stand to be apart?
The reality of the situation is that sometimes it's healthy to do things separate from your partner.
Another consideration is the fact that sometimes the relationship is over and you need to let go.
Both of these circumstances require that you overcome your anxiety related to confrontation or your worries about what would happen if the relationship ended. The end game should be a healthy relationship that both you and your partner fully enjoy.