I keep 2 road bikes - one at my bf's, one at my house. It's just a pain having to bring a bike with me everywhere just in case I might spur of a moment decide I want to ride (he lives about an hour away from me)... and then worry about the bike getting stolen from the car, etc. But that also means when one bike is having issues or needs to be fixed, I have a spare bike that I can ride. One of my bikes is carbon, so I'm always worried... what if I crack the carbon? and then I'm bikeless till I can get a new frame.

I have a 3rd bike that's basically a flat bar road bike which is my commuter, ride into the city bike... it's also got fat wheels & fenders if I want to do the towpath or gravel roads. It is also the bike that I lend friends if they want to ride with me... Just because, it's flat bar and not too intimidating. I've got a rack & panniers on it so I can haul stuff or grocery shop on it....

So I'd recommend keeping your old bike if you like it and it fits and is comfortable. I have sold old bikes that I hated it and didn't fit right. But it's often hard finding a bike that you really like.