Hi,
First off congratulations on the birth of your daughter. My XP sounds exactly the same as your except I left him when DD1 was a year old I couldnt handle his drugs, criminal activity or physical and mental abuse anymore. It was very hard to adjust to he saw her every 2nd weekend for about 6-9 months after our seperation then just became uninterested which honestly was fine by me his lifestyle choices were not something i wanted my daughter around then 18 months ago i got a sms from his sister saying "Michael doesnt need or want claire in his life now he has 2 other daughters" this hurt me terribly although it was what i wanted the wording doesnt need or want my daughters not an unwanted gift shes a human being. Anyway back to you got side tracked sorry! Have you thought about setting up a meeting with a solicitor and getting mediation done so that visitations ect with him and his family can be legally worked out? Also with him giving money to his new gf have you contacted CSA because he has to give you money to help support your little one, if hes unwilling to hand over the money himself child support can deduct it from his wage or centrelink pay before he even gets it thats the way i have to do it.
Best of luck.