My ex and I got in contact after 2-3 months, i'm so confused and need advice?

It sounds like she may be confused as well. I will give you a link for help with self esteem and relationships that you can go over and if you have mutual friends perhaps they can suggest this site to her as well and it may help her also. Other than that, you have to think of her as just a friend for now until you see some indication that she may want to try again and date others if you get a chance. You may find someone else or she may see you moving on and feel bothered enough to try to get you back.