Exactly (my bolding).
No it “sounds like” nothing. When you are not given information about something then it doesn’t “sound like” anything, it’s simply a lack of information. Does it sound like the husband drives a red sports car? Also it does not sound like he made up the excuse on the spot, once again, there’s not enough information, we don’t know what his tone of voice was or whether there was hesitation or anything. If someone asks me what I’m doing and I say, “I’m going to the shops,” and they say, “why?” And I say, “because I want to buy some clothes.” Does it sound to you like I made the excuse up on the spot? Or does it sound more like I provided information as it was requested? (B-but, surely you would’ve mentioned the clothes straight away!)
Personally, if my wife told me she’d met a guy at the bank and had exchanged phone numbers because she thought he was nice and we might get along, I’d be annoyed. I’d be annoyed because I don’t want any more friends thanks. But that’s me, I’m not the wife in OP, and I don’t think we’ve even been told WHY the wife is annoyed. If she’s annoyed because she thinks husband is thinking of cheating then the facts as presented don’t support that. On the other hand if she’s annoyed because she doesn’t like other people finding friends for her and her husband KNOWS this, then she has every right to be annoyed. If the husband doesn’t know that then she can be annoyed but she should understand that the husband was not to know and explain to him that she’d prefer he didn’t do that.

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