To be worried about friend?

[PinkButterfly855]

She lost her husband in November 2016 from cancer. They were true soulmates.
In August last year she met a man months out of a 13 year marriage. He was cheated on and was heartbroken. Yet him and my friend had an instant connection and just a month on, she said she was in it for the long haul and would fix everything that had happened and be there for him and his kids.
I have met him and I know he loves my friend but he is very hung up on his ex. Talks a lot about how wronged he was and how my friend has come along and been a better mum to him then his real mother is. They see each other just of a weekend but friend said she is completely in love, never been happier and can't believe she has met another soulmate.
I am concerned for her. It doesn't seem like she is seeing things all too clearly and because they only see each other once a week, of course its blissful. To me it seems like he has a lot of hate towards his ex which doesn't seem to see any sign of abating. Please tell me I am worrying for nothing and this can work out? I do feel she is still vulnerable and am worried she will get deeply hurt here.

Friend has come along and been a better mum to his kids than their real mum I meant to say.

He was also 3 months out of the relationship before getting into a relationship with friend.

It's hard to tell. My mum and stepfather got together under similar circumstances and although the first couple of years were a bit unsettled while everyone dealt with what they had all just been through, they've now been together for 20 years!

Just keep being supportive of her, if it all does go belly up, she'll only lean on you if you've been consistently 'on her side'.

Thank you. I haven't said anything against him but its clear he has not learnt from his past relationship ending and is very much blaming his ex, wanting the sympathy from anyone who will listen.
If he gets married to my friend, this will be his third wife and he has four kids by three different women. Not judging but not the greatest of track records and shows he hasn't learnt much.
My friend and him are like teenagers together but I do think she is looking at things through rose tinted glasses. I can't help but worry for her. She has been through a lot.