It wasn’t Richard Vera on the phone but Aubrey herself. She just told him that Angela wanted him to be present on her birthday. It was just an invitation but the fact that Aubrey used Richard’s phone meant that they were together.
Collin was aware that Richard and Aubrey were working hand in hand to group their business venture, and although his father, David Hendricks, was also a partner, he couldn’t demand him to help with his cause. Besides, David refused to help him when it’s about Aubrey because the old man cherished Aubrey like his own daughter, and it was also true that he was the one who betrayed...