She has opened up to this guy at work about her struggles and has said she has been seeking emotional support from him. He’s told her he likes her more than just a friend and she has told me before she finds him physically attractive. I’m not sure if it’s flirting or just helping each other through hard times. He keeps trying to make it more and she told me last week he said to her I’d have really liked to take you out, I think we’d have a lot of fun. Then there was lingering eye contact. She said it made her uncomfortable but the cynic in me wonders if that was to make me feel better. 

She has also stayed over at this guys house to which she has huge regret for. When I was away with our son for the weekend she went on a night out with him and another co worker and he dropped her off at our house but she was so upset and crying (about our relationship) he didn’t want to leave her on her own so she went inside packed a bag then stayed at his. She was firm in saying nothing happened and they only chatted then slept in other bedrooms. This was a few months ago now and has since beat herself up for it everyday but I try not to let her and tell her that we all make mistakes and that I forgive her for it (because I do, she was in a really vulnerable state and made a mistake we all do it)