Are the Crown Prosecution Service allowed to keep piling on separate charges for the same Incident?

Ok, so my friend was in a relationship with his girlfriend for 20 years. Very happy together, very few arguments, seemed made for each other. The past couple of years the relationship started to break down. She kept kicking him out and then asking him to come back after a week had passed. Then at the beginning of this year she kicked him out again but also cut all contact. He couldn't handle that and wanted to know why she wouldn't even talk to him and after a few weeks had passed he did something very very stupid and broke into her house (where he had lived for 10 years). The problem is he took tools in there to break in with, namely a hammer and a Stanley knife. He's been charged with aggravated Stalking and suddenly aggravated burglary has come up as well. I've been told that she has begged the police to drop the charges but they're going ahead with it anyway.

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