"Married at First Sight" isn't working out so well for the couples this season.

Ryan De Nino and Jessica Castro are the second couple to split after the finale, according to People. Their impending divorce comes less than a week after newlyweds Davina Kullar and Sean Varricchio called off their marriage.

Unlike Kullar and Varricchio who showed instant chemistry, De Nino and Castro struggled with their relationship throughout the season, sometimes resulting in knock-down, drag-out fights. The couple appeared to be on the mend as the second season closed.

Castro had other ideas. She reportedly took out a restraining order against De Nino, which he received and posted on his Instagram account.

 Unfortunately this isn't something I'd wish on anyone. To hear and read about the forum on Thursday to come home and find this on Friday. To see the IG on Sat and see the location was enough. They say first 48 for a reason. This is another fact here's the order of protection- which had me in awe and when I read it was disgusted. Bash me all you want, say whatever it is about me just remember this board don't break for nada. Why I posted this will be thoroughly explained when the times right. #CheckMate

A photo posted by Ryan De Nino (@thatkidnino) on Jun 13, 2015 at 2:46pm PDT

Fan forums for the A&E series also allege De Nino used drugs, left the reunion taping early. He also failed to show up for filming with Castro during their initial six weeks together.

A supposed insider on the forum wrote that none of the three couples in season two stayed together. The insider also blamed a faulty casting process for the disastrous results since only the women went through an official casting call and the male contestants were plucked of dating and social media sites.

A production source told People that the rumors about the reunion are "untrue" and Castro never accused De Nino of drug use.

The "Married at First Sight" two-part reunion special will air on June 16 and 23 at 9 p.m. on A&E.