The 24-year-old Teen Mom star, who began dating Massachusetts native Baier, 43, in September, spent Super Bowl Sunday together.
"AP holding my hand and nacho chips— best Super Bowl EVER!!!" the New England Patriots fan tweeted, which Portwood promptly retweeted.
According to an insider, the pair break up and make up all the time.
"They have a very tumultuous relationship," the source tells RadarOnline.com. "They get into big fights and Matt says he’s moving out. But then hours later, they act like everything is fine."
Portwood, the mother of 6-year-old Leah, has already been riding an emotional rollercoaster. Her beloved father, Shawn Sr., died from liver complications days before Christmas.
The recovering addict also just celebrated a year since her release from an Indiana prison, where she spent 17 months locked up on drug charges.
As RadarOnline.com previously reported, the MTV reality star and her unemployed boyfriend, a Teen Mom super fan, met on Twitter over the summer. A few months later, he moved from Boston to Portwood’s Indiana home to be by her side.
Will you watch Amber’s drama on the upcoming season of Teen Mom? Sound off in the comments.