Okay, so I have had Swimmy for about 10 months now, and everything was fine when I first got him. I have him in a 1.5 gallon fish bowl, I do a once weekly 100% water change and add a water conditioner to remove the harmful tap water chemicals. I had live plants in the bowl with Swimmy but my cat kept trying to eat the plants so I had to remove them.
About a week ago, my mother was changing the water for me as I was out of town. I told her exactly how to change the water and clean the rocks and how much water conditioner to add. She put Swimmy back in my room and walked in about an hour later to check in and she couldn't see him in the bowl and finally found him behind the bookshelf I have his bowl on. She said he was unresponsive at first but she took a straw and blew bubbles into the bowl and he perked up instantly. He has lost a good bit of his color around his face as you can see in the picture below, and he is a crowntail betta and had beautiful burgundy shredded fins, but the shredded parts have fallen off so it just looks like a normal fin, just slightly destroyed.
I did another water change today, 100% and noticed he was bloated. I shrugged it off and just decided to not feed him for the next few days, and I put him back in my room and turned my attention away for about 30 minutes and look back and he had a red thing hanging from the stomach, i have it circled in the photo along with where it was hanging off of him. I tried to get a picture of it attached to him but the camera flash startled him and he swam off really fast and it fell off so I got the best picture i could of him and the red piece.
I'm really scared and don't know what is wrong with him, I did everything I knew to do to properly take care of a betta but I don't know what could have possibly went wrong. Please help me out! I'm so sad that I may lose him, he's got such a great personality. Please please please help!