Making a promise to someone when you can't keep it is difficult. Especially if the promise was not made from the heart, but only to appease.
Leo feels that way. When he promised once and then reneged, he did feel guilty. But when he promised again and felt that he would break again, he felt there was no harm in apologizing to his wife.
Yeah. The next day, he couldn't keep his promise like yesterday. This time he actually met with his client to discuss a project that would benefit both parties.
The project he and his client were discussing was deliberately done outside office hours. All for the sake of establishing a cooperation that is not too rigid or tense. He and his client want them to get to know each other while running the project they are holding.
He sent a photo message to Erren that he was busy and hoped Erren would understand even though he knew in the end Erren couldn't protest.