Currently not sure how to feel... found out some devastating information... how should I go about this?

I (29F) have been in a relationship with my boyfriend (33M) for 1.5 years now. When we first met, he told me about his best friend that committed suicide in 2016 that he never got over. We don't speak much about it because it is an extremely touchy subject for my boyfriend because that best friend of his was like family to him. All I know is that it was a very traumatic event for my boyfriend and that his best friend died in the month of February. Anyways, I couldn't fall asleep tonight so decided to look at my boyfriend's old social media account... one photo led to another and that's when I found out his best friend actually committed suicide on my birthday. Everything makes sense now. Ever since I met my boyfriend, he was always weird around the time of my birthday and now I understand why. I don't know how to feel now... I almost feel guilty for my birthday being the date his best friend died... but not like it's something I can control. It's just a very odd coincidence... Should my boyfriend not celebrate my birthdays moving forward?
Currently not sure how to feel... found out some devastating information... how should I go about this?
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