E! Online reports that a text message from Mayer could have been what prompted the couple’s split.
When Romo learned that his sweetheart was exchanging text messages with Mayer, he then called things off with Simpson, since he didn’t appreciate that his girl was still keeping in touch with her ex.
However, one source mentioned that there was no chance that Simpson and Mayer would ever rekindle their romance.
Another close source also insisted that Mayer had nothing to do with the breakup, saying, "No way. Maybe they texted, but there would be nothing romantic."