If you can't stay happy by yourself, you can't be happy in a relationship

I think that's somewhat true. It's more about your personal insecurities negatively impacting your relationship. And the way you manage stress in day-to-day life. You need your own outlets and solo activities. That works for both partners. Sometimes you realize you start or stay in a relationship for the wrong reasons.

 

Agree 100%. Counting on other people to fulfil your life is selfish and just leads to bad relationships. I would argue that long term relationships only work if you've got your own life figured out enough to actively want to help your partner fulfil their life, with no expectation of reciprocation.

 

Agreed. It's not about what we can take from others to make ourselves happy, but what we can give to the other.