I have a friend who I liked (32f) who I backed off from when they got engaged to someone else(25m).

TL;DR I have a friend who I liked who I backed off from when they got engaged to someone else. Who is now trying to start a relationship with someone else while they are still engaged

I have a friend who I liked who I backed off from when they got engaged to someone else. When this person in the past admitted they liked me too. Recently this person told me they only thought of me as a brother or a friend also told me they don’t know why they are with the guy they are engaged to because they have always liked someone else. When I asked them if the guy they were engaged to knew about there crush they said yes. But it just seems weird to me that they are actively snapchating someone trying to start a relationship when they are engaged to someone else.