I dated my ex for about 5 months. Then we broke up, but we still keep in touch.
Should I get back with him if we still have feelings for each other, or its not worth it.

If you have NOT solved the issues that broke you up, what's the point? Why did you break up? How old are you?

Only if things have changed, remember why you broke up, if nothing has changed then you are right back where you started... and the second time around gets worse.

No you should not.