My dad spends all his time with his girlfriend. How do I cope with this?

All the time my dad is with his girlfriend. I see him 1 hour a day alone max. He's usually at her house, it's like they live together! And what's weird is that they haven't even been together that long and they already act married. I've always had an active parent figure in my life, no matter who it was they were always around at least 6 hours a day. I haven't even slept alone in a house by myself until he started seeing her. I wish he would come home more because I miss him. I've tried to talk to him about it, and he always turns the blame around on me to make me seem like a little child who is too clingy. Which is true, but I just want my dad around because when he's not here I just sit and rot in my house. How can I cope with this? How can I switch from being so dependent to being alone ALL THE TIME? Is he reasonable in doing this to me? These issues make for a shitshow for my mental health because I feel unwanted all the time.
My dad spends all his time with his girlfriend. How do I cope with this?
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