Friendship inevitably changes

The dynamics of friendship will change over time and can be very tricky in a working setup.

Psychologist Adam Grand's model shows that people are seen either as givers, takers or matchers. The giver wants to give (but don't get enough in return), and the taker takes from what they've handed. This can cause friction over time. However, those who can accept that the relationship has shifted and will not return have transitioned to becoming great co-founders.