Honestly I don't really know what to do?

I waited for my crush to get over her ex So I can asks her out , she had a really rough break up.3/4 months have passed till then just to find out that now she has a crush on someone. she is kind , gentle etc and she is actually looking for something serious , she values feelings a lot , yet she is chasing a guy right now that said he doesn't want anything serious and turned her away when he found out that she wanted something to last and the age gap is kinda big. Should I try or it's lost already? Right now she is waiting for him to respond and find out if he wants her and stuff like that
Honestly I don't really know what to do?
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