I don't actually see why a relationship is deemed to be taken to the next level with a marriage either if things are good and both parties are happy but it appears that she has a totally different expectation from the relationship. I just don't think this guy is ready for 'stability' raising a child and creating a family environment. 25 is way way too young for that.
As for his parents helping him out financially, yes there is nothing wrong with it but from what she described, these two people have a very different background. She is independent. Him very dependent on his parents is enjoying comfort for now that she provides. I wonder if this is an equal relationship between them in any other areas of relationship.
If I had to use a break up to manipulate, in my mind I'm already gone. It's pointless imo.
“Really, sex and laughter do go very well together, and I wondered - and I still do - which is more important.” - Hermione Gingold-