If you feel too torn inside, you do not have to make a black or white decision. You can make a "gray" one. You can ask for some time apart so you can focus on yourself and your own mind and heart. You can take this day by day or week by week, until you feel clearer about your situation.
If he pressures you and refuses to honor this request for a period of reflection on your part, if he gets angry or sarcastic or bullies you, then that behavior will probably help you get even clearer.
Sometimes "Forever" choices are just too hard to make when we are so confused and torn.
But some time to yourself without anyone's manipulation of your thoughts would be a great help.