You won't have to worry about it, because pretty soon this jackass will never talk about your personal business again. Why? Because you're going straight to your boss and/or HR person at work and reporting this guy for his slimy behavior. Giving you grief about your crush is one thing, but he crossed the line by turning the talk sexual. Inappropriate for the workplace, and a clear case of sexual harassment.

Protect yourself and go talk to someone in charge. Explain that your coworker is harassing you and creating a hostile work environment with his sexually charged comments. Let your boss deal with him. He'll get a warning (or possibly fired if this is a recurring thing) and will keep all of his conversations with you work-related if he wants to keep his job. It doesn't sound like this guy is a friend. Sounds more like someone who you don't trust and are afraid of his actions. So take control of the situation and report him. This isn't high school; this is your workplace. You shouldn't feel uncomfortable.

If this doucherocket still spreads gossip about you, talk to your crush. Tell him that [jerk coworker] is an idiot and talking trash. Chances are, the crush will just chalk it up to office gossip. Perhaps this is your opportunity to talk more with your crush. Again, take things into your own hands. Get to know him, become friends. Maybe try to grab lunch together or organize after-work drinks with coworkers (don't invite the douche) and invite the crush along. Don't just sit there and let people gossip about you. Because, people are going to gossip either way. Work is boring and the only respite for many is gossip. So don't worry about jerks and do everything you can to spend more time with your crush outside of the office. And get that gross jerk fired. It's 2011-- you shouldn't have to work with people like that. This isn't an advertising firm in the 1960s or a mid-level paper company in Scranton. You have rights. Don't take this guy's abuse.