Ex cold & hot

Well as the topic say my ex goes from cold to hot.I will try to keep this short also.Me and my ex have 2 kids and 1 in heaven was together 8 yrs.Been split for close to a year now.Well she tells me she dont want any1 and canned her rebound guy.Well she ask to stay the night wants to go places with me now and then.We still sleep together kiss hug and all that.But when i ask about us she says she dont want to be with any1 and dont have any feelings for me.My question is why if she didnt why would she sleep with me kiss hug me and want me around she even tell me she misses me.Should i just not ask about me and here and let it be and go with the flow and see where it takes me or what i just want her back in my life full time.