Just clicks one single time, even with it being jumped it will not start now?

So, it started with my car taking a little second to start up, then it got to the point where I had to jump it to start it and sometimes when I went places, I wouldn’t be able to turn the car off. The other day when I was driving the stability, ABS battery etc, lights were flickering. I’d lose power while driving now the car won’t start and when I turn the key it just clicks one single time. Even with it being jumped it won’t start now. A friend of mine and I were looking, and it looked as if something may be disconnected from the starter.