I personally don't think it's ok to interact with an Ex unless it's to send condolences for loosing a family member or to talk about kids if you have any.
Here's reasons when it's ok and not ok to text ex bf or gf just in case some of you forgot......
http://www.thedatereport.com/dating/advice/1118-ex-etiquette-when-it-is-and-isn-t-ok-to-contact/
