That’s how my relationship with my wife started. At the time, she was on the verge of getting engaged to another man. When that didn’t work out, she turned to me, and we had nearly 30 years together, before her passing. Before that, I had several female friends who were very attractive, but I was not overly sexually attracted to them, as their SO’s were also friends of mine.
In the past few months, I have felt attraction to a couple of women friends, but this sort of thing takes time for a widower.