MAJOR PROBLEM!!

okay so my ex that I have a 1 year old daughter with have not been together for about 2 years and I can't stop thinking about him i dont know how i feel but I have a bf hes the sweetest so i dont know if im just feeling some way towards my ex because i keep thinkijg about it or something but i tell myself we wont be good for each other im just so confused about my feelings towards the father of my baby.