Teen Mom 2 Love Lives: See What's In Store For The Cast In Season 7

Chelsea, Jenelle, Kailyn and Leah will face changing dynamics with former and current partners.

Since Chelsea, Jenelle, Kailyn and Leah began their Teen Mom 2 journey, the four young mothers have openly chronicled their respective relationships with boyfriends, husbands and exes. And when the long-running MTV series returns for a seventh season on March 21, the MTV cast members will face changing dynamics with their former and current significant others. Let's rehash what's on the horizon for the girls, based on the trailer below:

On a happy note, Chelsea and Cole take their love connection to the next level and are readying themselves to be husband and wife. Another adorable moment between the sweethearts: The very smitten future DeBoers kissing on the couch, while Aubree repeatedly states "ew." Better get used to this sweet PDA, Aubs!

Meanwhile, after a series of makeups and breakups, Jenelle and Nathan are officially over and clashing over custody of their son Kaiser. But Jenelle has already moved on and is off the market once again: The 24-year-old has a new man named David in her life, and the L-word is already being used. But two people don't approve of this blossoming romance: Nathan states that David was just released from prison for domestic violence, while Jenelle's mother Barbara can be heard screaming that David is the "worst boyfriend" her daughter has ever had.

In addition, Kailyn and husband Javi are bracing themselves for a difficult separation: The airman is being deployed and will be away from his family for an indefinite amount of time. There's also a heartbreaking revelation: Kailyn emotionally discloses that she suffered a miscarriage, while Javi tearfully admits how much he wanted the baby.

Lastly, Leah and her former husband Corey are about to embark on a major co-parenting change: The young dad learns that he is victorious in the legal case against the mother of three and becomes the primary legal custodian of their twins Ali and Aleeah. Leah can't hold back her tears and even wonders, "What's life without your kids?"

Be sure to stay with MTV News for more Teen Mom 2 updates, and catch the premiere on Monday, March 21 at 10/9c.