Is this a red flag?

[Rosie19901]

Hey
My best friends friend said that my partner approached her in the pub asking if she had a sister and some other small talk - he didn’t know her , she said no and then she left.
After she left my partner added her on Instagram and then messaged her saying ‘Hope you don’t mind the random add , was nice to meet you’
She read the message and screenshot it so I could see it. He then deleted the message.

I know there was nothing suggestive in the message but am I right to feel he had intention for messaging in the first place?

Thanks

Definitely trying to hook up with her.

A few years ago I went along to a friend of a friend's birthday drinks/party where her boyfriend was very friendly with me but afterwards - either emailed or whatsapped me, supposedly 'friendly' but I can tell flirting when I see it. I told his girlfriend (on advice from my friend) and she dumped him as he'd crossed a line.

He is single he says! Make him so!

He is single he says! Make him so!

Get rid of the scumbag then. He can enjoy being single.

Obviously and very affirmatively yes.

Ditch him now. Tell him he must have mistaken you for a woman who likes to play games and be one of many, that's not you, but wish him all the best in finding this lady.

Block and no contact.

Nice lesson for him.

The fact that he deleted the message means he knows it's something to hide. Sorry OP.

Need to know if you’re together or not

if he’s single he’s entitied to do as he pleases, as are you

if you’re together, he’s out of order.

Thanks for all your responses.
I can see why it’s confusing - basically we’ve been together 7 years and engaged for 4. He recently started not knowing what he wanted . Breaking up with me and then decided he wanted to try and make it work. We were still sleeping in the same bed etc acting like a couple.
Unfortunately for me while I thought we were still trying and commited - he didn’t . He just didn’t fancy telling me.