It's a proper breakup, though possibly a devistating one. He has told his girlfriend of 4 years that it's over and that there's someone else so not to contact him. Usually, the guy thinks he's doing the right thing as he's being honest about what he wants and the reason he has ended the relationship (He's found someone else). But usually he's had something in the works with the other girl for a while before telling his girlfriend about it. However, if it is really a girl he only just met - chances are this is the kind of guy who will come to realise what he's done, and claim he made a mistake and desperately try to get his long term relationship back on track! After your boyfriend has done this to you, it's really hard to get things back on track even if he comes back begging because he's caused so much distress and pain and it causes trust issues and breaks a lot of bridges which can be difficult to be rebuilt. The ex girlfriend should give him the no contact he desires because of the decision he has made, which is quite clear. He doesn't deserve any more of her time.