My husband admits he has a 'soft spot' for his best friends wife and says it's nothing. Is this common in relationships because he says it is?

my husband and I have always had a good relationship at least I've always believed us to, but in the last year or so he began to act a bit strange around his best friends wife, he'd get so excitable around her. He acts really helpful and will behave like such a gentleman around her (not that he isn't usually but more so around her) he will take her side when we all joke around together and I find it so annoying. And to top it all off he now talks about her a lot too. I decided to front him out about it and told him I'm sure he has feelings for her! He denied it at first but then said maybe he had a soft spot for her. He told me it doesn't mean he has feelings for her, they just get on well together and are just good friends. He said its normal for people to have soft spots for other people whilst in a relationship. But is it? I trust that he wouldn't cheat on me but is this normal?
My husband admits he has a 'soft spot' for his best friends wife and says it's nothing. Is this common in relationships because he says it is?
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