Hey guys! I need help

I need your advice.
There was a guy i used to talk to,went talked everyday and went on a date but that's it.i felt that something was off with him....no matter how much he begged to go on more dates i kept making up excuses and to be fair i was busy doing my practice at the children's hospital anyways.
He got mad at me for not texting back asap...but i was literally around sick kids,so fuck him🙄

Anyways, when he found out i was sick he refused to talk to me.
He started dating a girl.
Recently he reached out,tested the water...of course i did not respond.

But....i found out he is still with that girl. Not sure if he wanted to cheat or dump her if i said yes...
He said " It is no fix"
How gross is that?? (He is french so sometimes his english confuses me but i am pretty sure "It" meant that girl)

She seems to be in love and imagine marr,lying him and having kids with that piece ov shit.
I feel bad for her,she seems nice and deserves so much better.
Should i send her an insta message about him? Also i am pretty sure he is now back on fetlife looking for someone else...