How can I love my dog again😢

Okay no bashing me or rude comments about what I am about to write. I realized today how poorly I have been treating my dog. His name is Diesel. I rescued him off Craigslist when he was only 3 months old. I have had him by my side for the past three years. He is funny, he is a little weird in his own cute way, he is potty trained and acts like a diva sometimes and doesn't like to go outside much. He is an amazing dog, he doesn't jump on my couches or bed. He isn't the friendly type of dog with people other then who lives in our house(My boyfriend, me, and 4month old Estella). I don't know why I am posting this maybe guilt or idk. I need to get it out not to be judged but I know I need to change my ways. We had our beautiful baby in November and it started as soon as we got home with the baby. I became very annoyed with the dog. Mostly scared he was going to bite my baby or trip me walking with her or something. I kept imagining scenarios in my head of what he would do. So I started to become distant with him. I have a gate between my kitchen and living room, I would leave him in the kitchen and not let him around the baby. I barely played with the dog anymore and slowly stopped caring. Don't get me wrong I don't beat him, or lock him in a room I just don't show him the love I once use to and I want to fix it. I was scrolling through my old pictures today and all I could do was cry. He use to be my bestfriend. He was always there for me. And I forgot about him once I had my baby. I feel horrible. I will never get rid of him. I am crying typing this. My twin sister even noticed how I treat him now and always tells me "start loving him again he was your baby once you know". Please does anyone have suggestions on how to go about this?😢