In Need of a Good Bike

[bigboi146]

So since last summer I decided that I loved riding bikes. I always had this bike and it's been nothing but problems. I've had to replace a lot of parts on it so far and I'm sick of putting money into. I'll admit I'm a heavy rider (270 came down from 315) and I want something that can support my weight without breaking the bank. My usual route consists of me riding from home to central park, around central park, and back home. About 11 miles(google mapped it for the first time ... boy that's a lot) It's current condition is a flat rear tire(due to a bald tire)(my legs are brushless )
But anyway does anyone have any suggestions I'd like to stay on the bike so I can be a skinny bigboi146 :)