If you are feeling depressed then you have to do something about the situation you are in.
No easy answers. Expressing your doubts would be a good start, especially if he's noticed something is wrong and would be inclined to be understanding. Gently and slowly, one point at a time.
The alternative is to stay in and act out the rest of your life. Only you will know if this is the best option or not but it doesn't sound like it.