Should he had told me he slept with his friend before?

Anonymous
My boyfriend has a close female friend he has know 25 years that he talks to daily and sees a lot. She pops up at his house randomly and before we became official would stay overnight at his house on the guest room. He did not tell me in the beginning they had slept together about 6 years ago when they both went though a divorce. I do not think he has an romantic feelings towards her but I believe she still likes him due to how she has acted and not seeming to like me at all. Is disclosing their past sexual encounter something he should have told me from the beginning? He didn’t until I asked myself and then he told me yes it had happened. He told me he sees her like his crazy sister now and that it was a long time ago. He also asked why I asked and I told him it was comments she had made about seeing his junk when he was injured and how her ex thought they were when she was getting a divorce. She has been coming around a lot less the longer im in the picture but I’m uneasy about the situation.
Should he had told me he slept with his friend before?
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