Should I rethink the relationship?

My boyfriend confessed he had a crush on my best friend (who was and is in a relationship and she’s actually his university partner) , this was almost a year ago , but since then I’m having a hard time seeing they are in touch all the time, I know it’s just university stuff but I’m thinking maybe this is beyond what I can bear.
When I tell my boyfriend he says he always had partners in school and university stuff and he doesn’t have a close relationship.
But just seeing they’re talking all the time hurts.
What do you think? Should I rethink the whole relationship?
Should I rethink the relationship?
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