EC2 Spot instance continually restarting after termination.

I am running a spot instance of an ec2 as I only want to use it occasionally. However every time I log in it is running even though I make sure to terminate it when I have finished using it. I have an image that I use to spin up the instance and since I (incorrectly) assume that now instance will be running when I log in I spin it up from the image and get a quota limit reached error as I can only have one instance running so I don't know if it is creating a back log of spinning up instance requests which seems silly but it's the only reason I can think of. If I stop the instance it doesn't create anymore but I want to be able to terminate it and leave it terminated until I decide to use it again. I don't know why this is happening all of a sudden. I have just done a check now and 4 times I terminated the running instance and all 4 times it started up again. I tried stopping it first then terminating and the same thing happened. For now I have stopped the instance but I would like to terminate it if possible. Any help would be greatly appreciated as my bill is running up.