India, March 12 -- Hollywood star Jennifer Garner's relationship with her boyfriend, John Miller, has hit a rough patch following recent photos of her and ex-husband Ben Affleck looking particularly close. According to an exclusive source speaking to Page Six, John was taken aback by the images and felt compelled to set some boundaries.

The businessman "has always been supportive of Ben and Jen's co-parenting relationship but feels Ben crossed the line," the insider shared. "John knows there's nothing going on between Jen and Ben, but he doesn't think those photos are a good look and feels it's disrespectful to their relationship."

The pictures in question were taken during their son Samuel's 13th birthday celebration at Combat Paintbal...