I have a single friend who has had a lot of unsettled relationships over the last few years several with married men, she has been very flirty when drunk with my husband and has started at least 4 private message conversations with him(that he's told me about)In fairness about innocent stuff like gardening or toys her son might like but I've seen at least once she's invited him over. She knew I was upset with her about this because they aren't friends independ of me and I told her it crossed the line. I've been away visiting family for a week and she text me to ask about my trip but seemed to know id come back early...also a few other alarm bells we both have trackers on our cars but my access to husband's cars movements wasn't working last week he also told me randomly about bumping into a friend and how he gave him a lift home the other day. The friend happens to live on the same street as her also as soon as I got home he made a big deal about changing our bed sheets. We've had a bust up about his suspicious behaviour. I've never had a reason not to trust him before and he swears on our child's life that he would never do anything like that I feel so sad about it now...am I being stupid?