I love a vet with PTSD

so we have had a rough couple of months. we went from let's move in together and have a baby to we have broken up 3x's over the past few weeks. He's an Iraqi war vet with PTSD. he breaks up with me telling me I deserve better. I tell him I am not going anywhere. we get back together and we break up. it's an emotional roller coaster. Right now we are broken up, and I am a wreck! I want the future we planned, I want to love him, I want him to love me. he says he doesn't know how to love. which I know isn't true because he did love me, he was all I have ever wanted. I really dont want to lose him! on top of it all my son told me I am going to be a grandma. I'm 36 I'm not ready to be a grandma. I know he needs my support right now too and I can't, I'm not handling life well right now.