I am 27 weeks and baby's dad seems less and less interested in how the pregnancy is going the…

I am 27 weeks and baby's dad seems less and less interested in how the pregnancy is going the farther along I get. He use to come to appointments, but now he hasn't even asked how they are going. I am concerned he is going to leave before the baby is even here, he was so excited in the beginning. Now not so much or at all. I don't want to do this alone. Anyone else dealing with similar issues?