Teen mom dating

I’m 18 &’ I have a 2 year old little girl I left her dad before she was even 1 he was an asshole who didn’t care about anyone but himself (I mean he looks for the baby he visits her &’ gives money for her needs &’ all but he just wasn’t into me I guess) now I’ve been talking to this guy for a while he’s really nice he respects me &’ he’s great around my baby but my mom doesn’t seem to agree with me dating Ik it’s hard to accept but I don’t see anything wrong with dating him or talking to him