Girls feeling can someone help me out with this one?

now i have been talking to this girl for like 4 months were are not together we are just friends that have strong feelings for each other.....i told her that i really like her and she told me that she's thankful god has put me in her life....now she has two young kids i have both meet...they both like me so does her family....we haven't yet, im not worried about that cuz i care about her so much, but i have been kissing her all the time even kissed her in front of kids. now lately we have been going from kissing to hugs and kisses on the cheeks that's even coo with me...but last week we have been going back into kissing now, but again lately she just wants a hug that has me really confused but i know everyone she has every loved has did her wrong in the past, including her baby daddy....now last week i told her i would never hurt her and all i want is for her to be happy, but it seems to me that she still playing back a little.....so my first question is why do you think she taking so long with me to be in a relationship, and also why do you think she change up her way towards me...second question is what esle can i do or say to make her realize im tellin the truth