Need help ASAP! Going mad.

Please bare with me, so my best friend of 20+ years has been single a very long time and is only new to the dating world the last year or so. She’s been through some a holes.

She’s met this guy on this Kik messaging site. The guy is married and has 3 kids, but he’s split up with his wife 6 months…. The kids are 11, 3 and 4.

She’s been on a few dates with him, done the deed, and says she can see him being her bf soon. Buys her little gifts, says they’re going a weekend away soon, wants to buy concert tickets for a few months away.

She also mentioned she believes he’s still living with his wife and they’re trying to work on Co-parenting but she won’t actually ask the question!! (I’ve asked her to stop holding back)

He’s gone on holiday with his “ex-wife” and kids only last week because apparently the holiday was booked and paid for before they split up and they didn’t want to take it away from the kids…

I’m going out of my mind and convinced this man is cheating on his wife and manipulating my best friend. My friend knows how I feel about it all.

I’ve found this man’s wife on Facebook and LinkedIn and I’m so tempted to message her, or follow him home and see for myself. She still has on Facebook “Married to and the guys name” but I think the Facebook page could be old, I’m not sure as I haven’t added her.

What can I do to save my friend here 😵‍💫😵‍💫😩😩