Texting an ex

Lastnight, I saw my partner's ex texting him...

Her message said.. "it's a shame you aren't working outside my house"..

He is a crane driver!

The issue I have is him talking to her, they split 10 years ago and she owes him £3,000.... he has deleted previous messages from her which is what has made this pain in my heart like he has something to hide

She is never going to pay it and obv uses it as an excuse to text him...

How would you feel? How do I confront him? What do I suggest to him?

I've already said i'd pay the 3k just to get him to block her!

My heart hurts and now we've suffered another disappointing AF... I feel sick to my stomach

UPDATE... He isn't sleeping with her as she lives far away now we've moved & he's always home promptly and spend all weekends together!

He got defensive about talking to her saying we'll have a fight. . But 10 years is enough waiting! Apparently she is expecting a pay-out!

UPDATE 2....

SO first talk went well... second about having a second LH surge saying we weren't trying around it could be the reason why we are unsuccessful.. went bad.. he smashed up our boiler sensor and then the kitchen....

He said he wished he fucked his ex as they could have a baby and that i failed himm...

God my heart is hurting!