When two becomes three : will you accept someone with their love one

Sometimes we dont accept the one who comes with our love. We become so possessive for our love that we want them alone in our life. The relations breaks just because of someone else enters in our lives. This is so difficult to accept our love ones with their love ones.  People says that a biggest happiness is to become a parents. But can anyone think about a single parents ‘child. What they feel? Who accepts such kind of child?  Everyone thinks that after becoming a parents their love diminishes but always remember after becoming a parents love never diminished it gets spread. It always spread positive vibes in our lives. So never think that when someone else comes in between two peoples he always spoil your life. Sometimes if the person is the one who we want our bond becomes more beautiful and strong.