Why is going on with my GF? ?

She recently got out of a 2 1/2 relationship with her ex and came to me 3 weeks later seems kinda rebound to me but...idk we went out for about a week and then she said we need time apart to think about her feelings cause she still has feelings for her ex yet she says she loves me with all her heart. is she just trying to ind out why she is thinking about him to try to make are relationship better or she trying to break up easy with me? PLEASE help