By Isobel Pankhurst & Charlotte McIntyre Love split heartache behind Cheryl and Liam Payne’s fresh start. Liam Payne and ex Cheryl haven’t had it easy. They had son Bear in 2017, when Liam was just 23, but split the following year after two and a half years together. Cheryl, 40, and Liam, 30, have been co-parenting ever since, but fans have barely seen Liam with Bear over the past seven years. So, when he recently posted a sweet pic of his little boy a rare glimpse into Liam’s family life it was a big deal. The snap, on Liam’s Instagram, showed Bear in a yellow jacket looking at a billboard ad…