Five of the Most Controversial Breakups of 2015

IN PHOTO: Singer Gwen Stefani (R) and musician Gavin Rossdale arrive on the red carpet for the screening of the film "The Tree of Life" in competition at the 64th Cannes Film Festival in Cannes May 16, 2011. 

1. Gwen Stefani and Gavin Rossdale (13 years)

Gwen and Gavin who had 3 sons, remain to be cordial with each other amidst the divorce. Gwen put an end to this marriage when she learned that Rossdale was having an affair with their children's nanny, right under her nose.

2. Ariana Grande and Big Sean (8 months)

For their endless PDA's and selfies together, who would have thought that Ari and Big Sean's relationship will end too soon? After 8 months, the 2 musicians chose to go on separate paths due to "their conflicting touring schedules would keep them apart", a source to E! Online has shared. Apparently, their resort to "touring apart" was to become "torn apart".

3. Amanda Seyfried and Justin Long (2 years)

In September, Seyfried and Long decided to end their 2-year romance. According to Us Weekly source, the couple had "different schedules and different lives". Apparently, they just grew apart and Long was "really brokenhearted."

4. Kourtney Kardashian and Scott Disick (9 years)

Kourtney ended her relationship to the father of her children, Lord Disick in July. The latter was spotted reconnecting with his former lover, Chloe Bartoli, early this year.

According to Daily Mail, Fox and Green filed their separation in June due to irreconcilable interests. The on-and-off relationship of this two was officially put to an end "after fighting over her career." A joint custody for their 2 sons and spousal support are requested in the separation.