Like others have said, it's better now than with a ring on her finger. If cycling is truly a passion with you, as it sounds, just make sure 100% that your next interest understands this. One of the better ways is to meet one already involved in the sport or get her to ride with you.
One of the ways I was able to get my fiancee to understand my love of the bike was to take her on a weekly family night club ride (easy 12 miles) and also take little mini-dates around the city on our bikes, just exploring and then stopping someplace to have a bite to eat.
She doesn't put on even a 1/100th of the miles that I do, but she understands my passion and is supportive....even going to my races and cheering me on as I get my ass kicked.