My pet dog died last summer, she was the only one I had, but I was sure after a year I would get over it.
Or should I say I had get over it there instead?
My pet dog died last summer, she was the only one I had, but I was sure after a year I would get over it.
Or should I say I had get over it there instead?
There is nothing grammatically wrong with your sentence, except a bit of possible ambiguity: it's not completely clear whether you mean
My pet dog died last summer; she was the only one I had, but I was sure that after a year I would get over it.
or
My pet dog died last summer; she was the only one I had, but after a year, I was sure that [at some point soon] I would get over it.
Without explicitly including the conjunction, either of those two interpretations are at least possible. Which one is more likely would depend on context.