@FudgeBrownie2019
I am so glad to see the lovely, helpful, and kind responses on here.
Your DH is a grade A asshole sorry sweetie. I have seen this behaviour before. Men who are flattered by the female attention (some men even push their conversation onto women, and they have little choice other than to engage.) Some men speak to and engage with other women more than men, under the guise of 'I have always got on better with women.'
They like to play the knight in shining armour, and be a shoulder to cry on for waifs and strays, and female work colleagues or neighbours or random women on the internet, or that they meet in their social life (via a hobby and sport...) And if the wife/partner gets insecure and jealous, BOOM! Double ego-boost points.
Very recently, a couple I have known for 10 years who have been together for 27 years split up. Basically, her DH was exactly like the man I have described/your DH; always flirting with other women, making women at work his friends, and as I said, saying it's because he gets on better with women, and he can't help it if he gets on better with women!
Well the DH is this case, had several cases throughout 2014/15 of a couple of women he knew - and was 'friends' with - (work colleague and hobby group woman,) who bought him gifts for his birthday AND for Christmas (several gifts each.) His wife was livid as they were expensive gifts. He was smirking and smug and said 'I love it when yer jealous.' 
She was torn up inside, and pissed off, and had had 25+ years of his flirty, 'can't help it if I get on better with women' bullshit, flirting with most women he met, making friends with them, exchanging banter etc.... (never men, always women...)
So she decided to get even, and started to flirt with and chat to every man she met - especially in front of him. Funnily enough, he didn't like it, and got a upset at this behaviour - ya know, the behaviour HE had been displaying for more than 25 years.
Anyway, 3 or 4 months in, she got chatting to a man from a new art group she joined and they went for a walk and a coffee together. Long story short, after 27 years together, and 3 kids together (all grown by then,) she left him for this man. 3 years later they are still together, and her DH has not stopped trying to get her back, begging forgiveness, saying he is sorry etc...
But the ship has sailed. She fell out of love with him, because of the way he treated her. She said even if she and her new man don't work out long term, she will never go back to her ex.
So these men need to watch it, flirting with and sharing banter with other women. Maybe you should try what my friend did FudgeBrownie2019!