Whew. I've just RTFT. I spent a lot of it picking my jaw up off the floor.
Firstly @JizzPigeon22 I'm so sorry for your loss. Your love for your husband rings through all your posts. This line I’m still very much in love with my husband is 💔
I see many people agree with me - I cannot see how there could be any issue with this. You've been really clear on the scenario. I'm really glad you have a friend like this - he sounds great.
It seems clear that his wife's reaction is based on her own unhappiness and insecurity & not surprising the marriage is over now.
I can't understand the kind of opinion that automatically sees a male-female relationship as suspicious, having to 'prove' that they can be trusted.
It starts with the marriage - be clear on how you both feel, trust each other & if something starts to evoke a response, talk about it, within the marriage.
Regardless of anything his wife felt, she was every kind of wrong berating a bereaved woman. Awful.
When I was married my husband had plenty of female friends, I liked it; some I knew, others I didn't really. Totally trusted him. Now it turns out that my husband was an utterly abusive dick who put me & our children through hell, but certainly his female friendships didn't cause an issue.
I had a lot of male friends, through my workplace at the time. We hung around together in a group, generally.
One of saddest things that happened after my marriage ended was how I was treated by wives of male friends. One I was particularly close to, came over a couple of months after my marriage ended. He was genuinely concerned for me. We arranged to meet for coffee a month or so after and he cancelled. Didn't think anything of it. Then he essentially stopped contacting me. His wife had always been insecure & suspicious of everyone he was friends with. It was clear to me she wasn't happy with him meeting me. I still saw him very occasionally in a group setting & would see her watching me like a hawk.
I'd no interest in him, but actually no interest in anyone, my marriage had left me in pieces & 7 years later I've had absolutely no relationships, not even a date. I can't face it.
I really really missed my friend though. He was someone I really was close to. I don't really take too much exception to this (it's different to OP's situation) but I wished that this woman and others, and friends who left me out of their dinner parties & stopped meeting up, could have seen how lonely I was and how much I missed friendship.
I can cope without a relationship but I miss friendships so much.