Reasons for his behavior:

1. Limited time together: Due to our separate living arrangements and busy work schedules, we only get to see each other a couple of times a week. This limited time together may have contributed to his actions today.
2. Long-awaited weekend plans: We had been eagerly anticipating the opportunity to spend two consecutive days together. The anticipation and build-up of these plans may have added pressure to the situation.
3. His daughter's new relationship: His daughter, who is now an adult, recently started dating someone. This new development in her life may have caused him to feel protective and concerned, leading to his immediate departure to address the situation.
4. Emotional reaction: It is possible that he reacted impulsively and emotionally, choosing to prioritize his daughter's well-being over our plans. This could explain why he left without considering the impact on my feelings.
5. Lack of consideration: His actions may indicate a lack of consideration for my emotions and the importance of our plans together. It is possible that he did not fully understand or appreciate the impact his actions would have on me.

Overall, it seems that a combination of factors, including limited time together, his daughter's new relationship, and a potential lack of consideration, contributed to his behavior today. It is important to communicate openly and honestly with him about how his actions made you feel and to discuss boundaries and expectations for future situations.