Search Results: getting a guy more into a relationship

So my best friend is literally the sweetest girl who has been dumped on a lot by guys and tbh I think it’s ruined her. She hates men like really hates them and it’s so sad because she once believed in true love. There was this one guy who she dated years ago which ended very badly. There relationship was really intense and chaotic. With him showing all there private messages to his friends at the time he didn’t know that my friend had been attacked a year before they met by a male friend which resulted in her having miscarriage.

After he showed all those intimate messages she more or less had a nervous breakdown and was on the brink of suicide. Years have gone by and my friend has done amazing with getting a degree and building her career etc

However about a month ago the ex who had shared all there messages decided to get back in contact with my friend. At first she told him that she could never be friends with him but now they have been texting. And she has me worried because it’s like she has gone in reverse. She said he will fall in love with her and she will ruin him in everyway possible for how badly he treated her. Him coming back into her life after 6 years has triggered her and I don’t know what to do?

I know many guys keep female friendships wether they are in a relationship or not just in case there is a chance with one of them.

Not all guys do that but a great number of men do this (keeping friendships for the chance of a possibility with them)

Well I am in a relationship but for some reason or another we had kept breaking up and getting back together. Now he says it's very serious and wants to make a family with me and just be serious with me.

I have one guy friend who said he would marry me, I keep in touch with him and my boyfriend does not know about him, but today it kind of slipped out into a conversation and he got mad with me and wants to know what i talk about with him and why i'm even talking to him in private chats etc. and I felt scared to I deleted and removed everything about this friend because i don't want to ruin what I have now..

but I somehow feel it's wise to still keep him around not cheating but just in case my boyfriend and i split, i have someone as possibility.. I don't like to start from scratch looking for someone and this guy could be back up

it sounds bad but really would you guys do this?
even if it sounds bad, maybe it's a smart thing to do?
I'm not going to talk or flirt with him but just keep him as contact/friend

What do you guys think?
Advice?