My husband is having an affair with his ex

So we’ve been okay and happy for the last seven years then this April I find lovey doves Instagram photos exchanged btwn them he straight out tells me he’s still in love with her n I broke my heart into a thousand pieces, we talked and we decided to try things again but I discovered they’ve been talking for the longest time but never met just lots of messages n saying one day they’ll be together n that’s like 2 years ago, I found out he sends her money almost every month n I don’t know what to make of this lady she know about me and my kid.

The crazy part is my husband really hid everything very well even after finding out he still find new ways to communicate n hides he even created a new email account just to talk to her, I dot know what’s wrong cause the way I know an affair works is the lady would want him to leave n they’ll find a way but years and it’s just talk n promises n sending money. Guys what do you think of this?

Ps: am preparing to leave him even though I still love him cause the hurt is too much.