Duh it's obvious
Do you have a friend who is in a toxic relationship, and as an outsider, you think, "Why the heck are you still there? Isn't it obvious?" Well, I’ve been on both sides of that situation, and it's easier said than done. As an observer, you don't have any feelings attached, so you look at it more rationally. But honestly, it could happen to anyone, and we should always keep that in mind before saying anything further.
It's important to offer support and understanding rather than judgment. Sometimes, the best thing you can do is listen and gently remind them of their worth.