Last week on "Teen Mom 2," Chelsea Houska was thrilled to spend time with her boyfriend Cole as he prepared to move in with her, and Leah Messer checked into a rehab treatment facility while Jenelle Evans got arrested for allegedly assaulting Nathan's new girlfriend. 

Chelsea was over the moon as Cole was about to move in with her. Her daughter Aubree seemed to have no problem with this, with the little girl even making Cole a Father's Day card and appeared to like him well enough. But Aubree's father, Adam, decided to go to Denver for the weekend, and the girl was not able to spend Father's Day with him. When Chelsea asked her daughter if she was ok, Aubree said that she wished her father was more like Cole. 

Meanwhile, Leah finally checked into rehab and appeared to be doing well. In her absence, her exes, Jeremy Calvert and Corey Simms, met up to talk about her and what her prescription pill addiction could mean for them and their respective children with Leah. The two commiserated about the situation, saying that if it was them who had the drug problem, they probably would never see their children again. 

Jenelle was seething after learning that Nathan has been seeing another girl. Jenelle said that Nathan has been giving her mixed signals and she thought he wanted to be with her again. When he brought his new girlfriend with him to Jenelle's home, trouble ensued and Jenelle claimed that Nathan hit her with his truck, while it was reported that Jenelle threw a drinking glass at the girlfriend. 

Jenelle's lawyer, Amy, sat her down and gave her some advice. The lawyer said that Jenelle and Nathan had to stop this — they're using their child Kaiser as a pawn.

"You don't need a man to be complete," said Amy.

Later, Jenelle was shown getting her mugshot taken.

In the next episode of "Teen Mom 2", Jenelle is released from jail and is now arguing with her mother Barbara about the custody of Jenelle's 6-year-old son, Jace, who is very close to his grandmother. Jenelle is happy that they could sit down and talk about it, and Barbara says that for her, it is important that they have a good relationship for everyone's sake. 

"I think we have to get to some kind of an agreement and tell the lawyers that we're holding off on this court thing right now, don't you think?" Barbara says in the teaser trailer for the Sept. 24 episode. 

"I don't know, what I think right now," Jenelle says.

"I just want what's best for Jace and your life is not…you're not settled," Barbara says.

"Teen Mom" airs Thursdays at 10 p.m. on MTV.