Kailyn Lowry broke down on Teen Mom 2 when looking back at her tumultuous relationship with ex-boyfriend Chris Lopez.The reality star, 28, detailed the highs and lows of her on-again, off-again relationship with Lopez, 26, during the Tuesday, October 27, episode of the MTV series.The episode touched on Lowry’s fourth pregnancy — her second child with Lopez — and revealed how she really felt when Lopez’s aunt posted a photo of her ultrasound on social media, announcing the big news before she