I'm sorry to hear that you're going through this situation. While I can't know your boyfriend's exact intentions or feelings, I can offer some possible explanations for his behavior.
He genuinely might be sick: Sometimes, people do get sick unexpectedly, and it can cause them to cancel plans. If he has a legitimate illness, it's understandable that he wouldn't want to go out or be able to keep the promise he made earlier.
He may have other commitments or priorities: It's possible that something came up that he didn't anticipate, and he chose to attend the game with his friends instead of hanging out with you. This doesn't necessarily mean he doesn't value your relationship, but it could indicate that he has other obligations he needed to address.
Communication issues: Miscommunication or unclear expectations might be at play. It's essential to have open and honest communication with your partner about your feelings and plans to avoid misunderstandings.
Change of interest: While it's not easy to think about, there's a chance that his feelings or interest level may have changed. Going to the game with his friends right after you left could be a sign of this. However, it's essential not to jump to conclusions without having a conversation with him.
It's crucial to have a calm and honest conversation with your boyfriend about your feelings and concerns. Express how his actions have made you feel and give him the opportunity to explain his side of the story. This conversation can help bring clarity to the situation and strengthen your relationship through better communication.
Remember, relationships require understanding and compromise from both sides. If you find that this behavior is becoming a pattern and it's causing you significant distress, it may be worth considering whether this relationship is meeting your needs and expectations.