I feel so lonely

Me and my ex boyfriend broke up in Jan. 2018 because of long distance but still started here and there as friends. I started seeing someone as a rebound in April 2018. I found out I was pregnant in July by this new guy and I was completely devastated. I told my ex boyfriend and we completely stopped talking. I tried to make it work with my baby’s father but I honestly had no real feelings for him and throughout my whole pregnancy I was extremely depressed. We argued every single day and he always tried guilting me into being with him. In September I found out I was having a girl and I texted my ex just to tell him the news. We hadn’t talked in months but he was happy for me and we started talking again. We actually became very close and talked about getting back together one day after I had my baby. Recently we got off track again mainly to do with the fact that I’m a single mom and I feel like there’s a constant pressure on me to be perfect for my daughter and I just feel like he isn’t ready to grow up. We live far apart so it isn’t like he can come over and really be a stepdad to her until college is over. He tells me he loves us but then goes on social media liking all these girls pictures and calling them cute so how serious does he even take me? On Monday we got into an argument and I told him I don’t need him and will never need or rely on anyone ever again but truth is I love him and I miss him like crazy. I feel so lonely everyday I try to focus on my daughter but I wish I had someone to care about me and love me. I’m only 19 and my mom says I’ll eventually find someone who genuinely wants to care for me and my daughter but I feel hopeless. I know I can’t force him to love us but it makes me sad to think that for the rest of my life I am going to be alone and my daughter will never experience having a father.