Any good advice?

I think I’ve become a bitter person because of my ex why because everytime a guy flirts with me I stop him right away and I don’t smile or
go out on dates even hang out I know it’s wrong to be this way and I don’t to get worse I’ve changed and I don’t like who i am I used to like who I was before meeting him but sadly there’s no turning back now...
Any good advice?
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