Your potting mix looks waterlogged. Looks like some of the mint is already rotting from excess moisture. Is this true? What's your watering routine?

Hi JoJo, thanks for the response. Yes I believe I may be overwatering it...I water it 3-4x week, but I put a lot of water in. How do I solve this? It also has these small white specks (bugs I think?) all over the leaves and they are sticky.

At this point I would remove the healthy parts and replant in a new container, with all new potting mix. Remove as much of the old soil as possible and discard it. Wash the old container thoroughly (even with bleach). And always check before watering if the plant needs it -- stick you finger in the soil to make sure it's dried out a bit. Winter overwatering is a big issue as plants slow down and don't need as much water.

Thank you! I will try doing this. Yes I believe I overwatered it. I guess I will just buy and plant a new one because all the leaves look like they are covered in these white specks now.

You have a heavy infestation of aphids. The stickiness is honeydew, their excreta. Indoors they're often a problem because there’s no wind or rain to keep them in check. I would remove the healthy bits and, before replanting, wash them thoroughly under running water. If you buy a new one make sure the aphids have been eliminated from the area. Otherwise they’ll just move to the new plant.

Despite what the internet says, mint is an outdoor plant, not for indoors. Very, very few people will have long term success with this this in heated living space. You're just begging for a bug infestation. What climate are you in? Many can grow can grow it in the ground year-round. I winter mine outdoors tucked up in an inside corner of my house in pot.