Am I overthinking this or are these red flag signs?

incandescentwithrage
A close friend of mine is seeing this guy. She met him through bumble. He's a volunteer police officer. A special I think I'm not sure about this. He's older than her too - she's 22. He's doing a PHD she's just started her masters. She's shy /introverted - has anxiety etc.

They've only known each other a month most of the time chatting on What'sApp - with a week off actually meeting each other. He started by constantly blowing up her phone / social media etc. She told me he made a "security check" of her uni house/area to make sure she was safe. They had a first date where he brought her a meal, took her shopping buying her breakfast bits and bobs stuff like that and giving her his contactless card for the tube etc. She told me he tops up her Oyster card too. He brought her a meal the next day too.

She told me that on the first date also he was the weirdest person to hang out with. He was taking notes of car registration numbers cause he felt that they could be potential drug dealers / prostitutes. There was an incident where her uni house had a potential break in , housemates car was smashed back door open. The date intimidated her house mate whom she's only just met too, saying to him that he's a police officer , and that's he "close" to this girl. If anything happens etc.

She told me about another time she was on a date with him, where he started "talking to this homeless guy... and was like "if I see you in this area again "... going into police mode whilst he was off duty. He told her this backstory of how they operate as a gang giving money to a boss that sort of thing. I got annoyed cause he was potentially putting her at risk, I felt he was showing off trying to look macho to impress her but she justifies it as "its his job" She's said that they've walked past junkies before and he wanted to do something but cause she was with him
Updates
+1 y
Also, he's gotten stabbed a few times ending up in ICU whilst on duty. She can't upload any pics of him to Facebook cause he works in the Counter Terrorist Unit in the UK and he said it could end up putting the person in danger , he's had a go at his friend for posting a selfie of them, but she can on instagram cause both of their accounts are set to private.
Am I overthinking this or are these red flag signs?
3 Opinion