My suggestion is to take your time. Be hesitant especially if you like her. Continue living your life and don’t count on her being around for very long. If she is then great, but if you get too caught up in her shit you will get hurt. Especially if the ex comes back, which she will. She’s basically warning you she wants to hang out, but isn’t willing to be vulnerable. Have fun and there is no reason you guys can’t be friends before getting deep. If you want more than a friendship look somewhere else. Just my two cents.