COVID and BF

So I’m taking COVID pretty seriously. I live with my sister who has a lot of medical issues and I want to keep safe for her. My boyfriend just started up his indoor hockey league. It’s nothing serious just some fun with teams around our area. They don’t wear masks during the game and he doesn’t wear one in the car with his friends going there. I want to keep seeing hi in person at our apartments but feel like I should just stick to seeing him outside with a mask. It’s cold where we live though so that sucks. Anyone going through something similar?