Your daily interaction and company will increase the friendship between you and your Catddles.
When you feed or play with your Catddle, the friendship between you and them increases. With a stronger relationship, output from production activities will boost.
A relationship takes time to build, and multiple interactions within a day will only boost the friendship level once.
Catddles will keep their friendships forever, under the condition that you do not abandon them. Users will lose their friendship when the ownership address is changed on their Catddle. Cross-chain without address change will not affect the friendship between you and you Catddle.