What does it mean if your ex-husband of one year calls once or twice a month but doesn't say much and when you leave him a message he always calls right back?

I think what that means is he misses contact with you. Why don't you ask him?

Answer

What does he say when he calls. If there are silences and pauses, why waste your time on the phone. Ask him why he calls, if there is anything he needs to talk about or get resolved. Maybe he hasn't gotten over the relationship and still needs something to hold on to, literally, the phone and your voice. I would say keep it short and sweet. Nothing wrong with remaining friends but there is something wrong with the silence.