If the colleague’s wife has no problems with her husband’s other female friends - just with OP - she’s seeing something specifically in this friendship that’s worrying her. Even if OP knew she’d behaved impeccably and he’d have to be mad to think she was being anything other than appropriately friendly…shouldn’t his wife’s reaction be a red flag that he might think it was more than platonic?
I’ve been (sort of) naive in the past. I was friendly with a male colleague I’d worked with for a while, just chatting in the office and going to the pub as part of a group - everything seemed totally above board. One day we had our break at the same time and he suggested we grab some lunch together. As we left the office he told me, conspiratorially, that his wife would be upset if she knew he was having lunch with me…and alarm bells started going off in my head.
- He’d sought out an opportunity for time alone with me despite knowing it would hurt his wife’s feelings. In telling me this he’d shared details of tension in his marriage, and attempted to make me complicit in doing something that was clearly not as ‘above-board’ as I’d thought.
- By manufacturing a situation where we talked about his wife behind her back, and spent time together without her knowledge, he was trying to create an ‘us’ bubble with his wife on the outside of it, and
- I realised for him to know she’d have a problem with us getting lunch together, she’d already raised concerns about me (suggesting he’d been saying or doing something that set off her spidey senses).
I was more careful around him after that. He quickly lost interest in being ‘friends’ with me and turned his attention to another woman in the office. I’d done nothing wrong - but his wife was right to be worried, because his interest in me was not platonic. I was mortified at the thought I might have inadvertently done something to give him the wrong idea, or that it might have ever looked like I was encouraging/enjoying his attention.
As it is, OP knows she’s not behaving entirely appropriately. She understands why some of the messages she’s sent would upset her colleague’s wife, she’s been told by a friend that she’s playing with fire, she hasn’t yet mentioned this out-of-the-blue phone call to her own DH, and she’s reluctant to share a summary of the more questionable messages she’s sent on here. I’d understand if this was an embarrassed “oh shit, I might have given the wrong impression” reaction - but if that was the case OP would want to change how she’s communicating to avoid looking like she’s flirting. She’s not doing that, she’s trying to find ways to justify continuing exactly as she is.
Once you’ve been made aware other people think it looks like you’re flirting, or you’ve been told that he might have the wrong idea, naivety no longer works as a defence. If OP is determined to tell herself she’s doing nothing wrong so she can continue the weekend/evening chats and ‘playful banter’ - ignoring the advice she’s had here, the warning from her friend, and the red flag of his wife reacting differently to her than she does to other female friends - it’s blindingly obvious she’s enjoying the attention and ego boost of knowing this man is interested in her. She’s risking her marriage as much as he’s risking his.