A lot of comments here use this metaphor of emotions as things that flow from a source, and need to be expressed or they will accumulate and explode. I think this can be traced to pop-psychology bullshit, and there isn't any neuroscientific basis backing it up. It seems like wishful thinking by people who like expressing their emotions to others and want to justify their spend on therapists, or their occasional emotional outbursts.

Instead, the evidence points to the brain building habits around emotions and their regulation the same way it builds habits around everything else. If you practice not feeling emotions or becoming identified with them, then that habit will continue and they will become easier to not feel. There is not a debt to be paid, or a buildup to be released.

This is often framed in different ways, mediators talk about "creating distance" and "noticing but not indulging". The timeless grug-brain approach is "ignoring", described by emotional people as "bottling up". These are different ways to frame the same phenomenon, which is that the brain does what it has practiced.