I really dont no what to do any more..any advice would be really appreciated

My daugter is 9months old. Her father & I split when she was 3 months - it was a mutual thing - we didnt want to be together anymore but agreed that we'd always put DD first. That was until he decided he wanted to be together again & i didnt. For the past 6 months Xp will:
- only take DD 'if he feels like it' or if he doesnt have anything better to do (his words).
- alot of the time when he actually takes her he brings her back about half-hour later(incl the night of my bday which he knew i had planned for weeks)
- ive asked him for help many different times but he either says no or makes plans then breaks them at the last minute.
- He says that he doesnt have to help me or i should get over it & do everything myself because apparently thats the way i wanted it (because i dont want to be with him)

It has actually come to the point where he has said to me that he isnt happy so he is going to do everything he can to make my life hard. Its like he isnt even thinking about DD & has the attitude of a selfish little teenage boy.
Ive really had enough - this has been going on for so long & i dont no what to do anymore. ive been putting up with it coz i want my daughter to have a relationship with her dad but its getting to the point where i dont no if its worth bothering..