Q: Car overheating

For about a week I have been hearing a squeaking noise under the hood. I don't know a lot about cars, but it didn't seem serious at the time because the car was running fine. Then, 2 days ago, the noise got suddenly louder and the car started to run hot. I checked under the hood and the noise seemed to be coming from the serpentine belt, but everything still seemed intact. I wanted to get the car closer to home, because I was a few miles away. Got back on the road, within 5 minutes, smelled a strong burning rubber smell. Pulled the car off the road, looked back under the hood, the serpentine belt was broken. Had to be towed back to town. I had no choice but to have it towed to a pep boys that's within walking distance to my house. They diagnosed the car as having a broken water pump, broken serpentine belt and also needed a new belt tensioner for about $650. ust got the car back yesterday, and the car is still running hot. Very close to overheating. Still coolant in the tank.

My car has 120000 miles.
My car has an automatic transmission.