With some twitter investigation I found some things that indicate this is true.
Maci tweeted earlier referring to Kyle as her ex but quickly deleted it. Kyle tweeted that "pimps don't fall in love." (huh?) I also came across a couple of tweets that are a bit odd saying that Kyle was asking for naked photos from another girl! (apparently singer Cady Groves)
@cadygroves: Hey @kyleREGAL before you call a girl askin her to send you naked pictures make sure she's not friends with your GF”
Yesterday Maci did tweet that Kyle had a "stick up his ass." So it looks like there was some falling out during Maci's visit to watch him race.
Honestly I feel that their long distance relationship was no good for Bentley who would often accompany Maci on her road trips and airplane rides to visit him and watch his races. She does a lot of traveling as it is so maybe living hours away from her boyfriend isn't the best idea.