I was diagnosed with a ascending aortic aneurysm by my family doctor. do i need to go see a heart doctor?

Yes: Ascending aortic aneurysms are treated once they reach 6cm in diameter. They are treated to prevent rupture. Typically they are monitored by ct angiograms once a year. A cardiothoracic surgeon is perfect to follow such a condition.

Likely yes: Ascending aa usually get eval by cardiothoracic surgeon and cardiologist. There is risk of rupture that increases with size and risk of involvement of aortic valve of heart and arteries supplying head and arms. Treatment options depend on your health and specifics of aneurysm. Blood pressure control and stopping tobacco use critical. I expect you will be getting referrals at some point in workup.