Unfortunately, there is no right or wrong answer as each breakup is unique. Nonetheless, communication is a vital aspect of any relationship and should always be explored in the first instance. Couples break up and make up all of the time. Remember, the no contact rule should only be used as a last resort.
You need to evaluate what your expectations would be, should your ex contact you. For example, consider how you would react if your ex only wanted you as a friend or told you that they were dating someone else. Also, why did you break up? Have these problems been resolved? If not, they will resurface at some point in the future. Furthermore, if one of you was unfaithful, can you really rebuild the trust?
If you ex does reach out to you, consider the request with caution. If you decide to stick with no contact, remember to work on improving yourself and your emotional stability.