What should I do?

If he only called once during the last 2 months then you should call him back but then the next time he calls ignore him--it will get him more excited and he would call you again and then you choose from there----now if called more than once in the last 2 months then you should ignore him--it is up to you after that.

Snub him.

If you like you need to see him, go see him. Though if you fee like, meeting him will hurt you in any way, then refrain from contacting with him for awhile.

How long has he been your ex boyfriend for? Have you moved on? Are you seeing anyone else, is he seeing anyone else? These are all questions you are going to have to ask yourself. Why is he your ex, was it your fault, his or both your faults? You have to decide on this one yourself, do you think he is going to be serious this time, do you know him well enough to know that his not gonna hurt you again, however, even if he does hurt you, is there a hurt that's worth it. If it was my ex and I wanted the relationship to be over 100%. I would not see him, only because I wouldn't wanna give him the opportunity to sweet talk me and bring me down again. But if it was an ex boyfriend that I still loved, still saw the good in and still wanted to try, I would see him to give him the opportunity to sweet talk me and get me back again.