A free mod for Stardew Valley, by iarspider.
Friends Forever is a very simple mod you can install in your device and can change the settings in the config file.
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Installation:
You can simply extract the zip file into your mods folder.
What does the mod do?
If you haven't talked to an NPC or petted an animal in a day, your friendship points will not degrade when you install this mod. Also with this, the decay of your marriage which happens by default can be easily changed in the configuration file.
The settings in the config file are pretty self-explanatory, you can find the description of the settings here.
