Do I really like him or is it just a crush?

As someone who has spent a fair bit of time going from one serious relationship to another (feelings usually overlapping) I agree. You should be comfortable with knowing what you want before you are in a relationship. If you find yourself wondering what could be with this guy, then perhaps there is something not quite right with your current relationship? Take some time for you to figure out what you want. That being said we are all human and occasionally get crushes on people throughout life. Its natural, its up to you to decide what happens next.

Take some time to think and process the feelings. Maybe it's just infatuation. I suggest waiting a while to see what happens

What it kinda sounds like is something that several people as well as myself do. You start to get a little bored with a relationship and find yourself subconsciously looking for something else, another thrill if you will. Maybe what you should do is decide if your current bf is what you really want. Can you see yourself growing old with this guy? If the answer is no, he's just a distraction, get out of the relationship before you hurt him. Don't pursue this other guy while you're in a relationship. It's not fair to anyone, especially you. Should you decide to end your current relationship, take some time, get to know you. Take bubble baths and discover what your passion is outside of guys. Learn to cook, read amazing books, fall in love with you. Once you've established a healthy relationship with yourself, take another look at your love life. If your office crush is still available and you think he's worthy of how awesome you are, ask him to coffee. Make sure your office doesn't have any rules regarding inter-office relationships first. If he's honest with you, single, it's okay to date within your office, and he's worthy of your time, go get him! One thing that I noticed. Don't you ever say that anyone is better then you! Nobody is better then anyone else, and no one can you're unworthy. You are awesome, you are you, and no one else can be you. So what if that chick sitting next to you is skinnier then you? She probably would get owned by you in videogames, or you do your makeup better then she does. That's why I said fall in love with you first before you continue in another relationship. If you're confident in yourself, then who cares what anyone else thinks. Good luck, sweetie!

You sound very confused! Get to know what you really want before jumping into ANY relationship...