Concerned about my roommate’s fast-moving relationship with a guy claiming to be in the military and need advice

I (23F) am concerned about my roommate (21F).

She’s recently started dating a guy (20M) after 3 days of meeting him on Snapchat, and they’ve already hooked up in person the day they met. He claims to be in the U.S. Army and is supposedly deploying to Germany in about six months.

They are moving at an alarming rate. They’ve only known each other for about a week, and he’s already talking about marriage, family, and money (like paying for her tuition). He calls her “ma’am,” opens doors, buys her food, listens to the same music as her, and shares a similar sense of humor as her. She says it feels different from her last two-year relationship.

She started talking about going to church with him, and she is an atheist. They have talked about money several times already, and she has told him that she and her dad have a LOT of money, and he introduced her to all of his friends and family.

I’ve already tried pointing out some red flags:

Following “e-girls” on Instagram who have OnlyFans accounts. (She is strongly against this, but thinks it is illegal to cheat in the military, so he won’t.) Talks about “knife play” and other weird shit. She admitted they’re moving fast, but she’s still sure about him and has no “bad gut feeling.” He’s making big promises like paying for her tuition and going to Germany.

She met him in person and hooked up, so it’s not purely online, but I’m worried this might still be similar to a « military romance scam » or some kind of manipulative situation.

I just really want her to change her mind because it’s not « too late. »

She has had some trauma, like her mom dying 2 years ago, and being in an abusive relationship.

Honestly, the worst part is that her therapist, friends, and dad are supportive, and I feel like the only sane one.

Has anyone been through something like this? How can I help her protect herself emotionally and financially? How do I gently encourage her to slow down and ask for proof of his military service without seeming controlling?

Any advice or similar stories would be hugely appreciated.

Thanks!!