Boyfriends new girlfriend...

My ex and I have two kids a son who was born 6 months ago and we have only been broken up a month and a half to find out Sunday when we were exchanging kids that he had a HIGH school girlfriend who’s asked to meet our kids already when they JUST began dating a few days ago .. I’m so upset my ex who’s 25 is interested in a high schooler.. he hardly sees our kids as it is but complains that he never sees them ( I’ve never held him back from seeing them ) uhhh I’m sorry I need to vent...

Edit : this is from her? Maybe I’m wrong but I feel she’s saying she’s already in love with him?