Search Results: getting out of touch with friends

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?

So this guy is a flatmate of one of my friends. I've seen him a couple of times, and our interactions always feel pretty charged. Like we will 'banter' but it doesn't flow as easily, but not in an 'we have nothing to say to each other' kinda way but almost as if we just don't want to transgress any boundaries. Thats what it feels like to me at least. We usually mock each other, and have a sort of frenemy 'friendship'.
Like, we accidentally saw each other in a bar and he came over and spoke to me the whole time until we both needed to leave.. (my guy friend said that based on our interaction he thought he was into me).
When we were in the cinema together (with group of friends) we sat next to each other and shared a popcorn, and he would like bat my hand away or our hands would touch etc.. but it wasn't obvious so I could be reading into stuff. Then we were talking about older men, and I joked about how all girls love an older guy.
Him: "how old are you?"
Me: I'm 21
Him: I'm 23.
Me: maybe if you have grey hairs I'd consider it.
Him: I've got plenty of them..
or when the movie screen went black before start:
Him : Are you nervous
Me (sarcastically): Yeah...
Him: First time?
I laughed
On the walk home we either had a very charged silence, or had mini arguments where one of us would deride the other. He walked with me pretty much the whole time. Or he like overtook me on the steps and was right in front of me, so I stepped on his shoe, and he then pretended to shove me down the stairs. He also then proceeded to make some sexual jokes. At the flat I put a pillow between us on the couch (in 'protest') and he was like 'stop being silly" and moved the pillow out the way and continued mocking me. Like I'm not sure if thats just him getting his angsty release or if he likes me?

Because I would think that he likes me, but he isn't adding me on anything fb/insta etc.. It might be because his flatmate could be weird about him getting with his friends? Idkkkk help