Technically, emotional cheating coz this friend wants to cangkul her from boyfriend. Girl likes the attention. If progress further becomes full blown cheating if girl belanja siham

Never underestimate female psyche. If potential suitor comes along with moneybags she will consider changing partner.
My previous company colleague did just that, was engaged with ex-fiance but a top dog managed to cangkul her as his wife. For her she upgraded.

Let's just say she's a ladyboss with comfortable lifestyle. Never looking back. But her reputation in the company took a massive hit. Small sacrifice in her mind coz she left the company not long after.

Sad part the beta ex bought for her japanese car using his savings as gift for engagement. She upgraded to merc once she found better option. Alpha makes the rules while beta follows it. The only consolation is the ex dodged a bullet. I doubt she will remain faithful even if they get married.