Cheesy Smoked Sausage Skillet

1 lb smoked sausage, sliced into 1/4-inch slices
1 Tbsp olive oil
3 cloves garlic, minced
8 oz tomato sauce
1 Tbsp tomato paste
1 Tbsp Italian seasoning
1 cup chicken broth
1/2 cup heavy cream
9 oz refrigerated cheese tortellini
1/4 cup parmesan cheese