Y’all need to understand that if you like someone, or want to do something in general, you need to take any chance you get. Like ok, I get it, the feeling is mutual between the ML and FL, but misunderstandings and miscommunication occur, they're not on the same page at the moment.
If the she starts dating the 2nd, then be it.
On another note, I do agree with Aleamhmd27, like why can’t the FL be in a relationship when the ML had an ex.