Now is the time to show all of them that you are dead serouis and not to be messed with by getting the Police involved and getting your property back. That kind of crap pisses me off.

Save your money to buy a better bike. Buy the strongest bike lock first. Let the boyfriend enjoy your flat tire.

Okay, nowhere in the post does it say the boyfriend knew it was stolen. Instead of "stealing it back", why no go up to the boyfriend and tell him the truth of the bike, then see if he'll give it back?

sit down with your parents and explain this calmly, and tell them you want your bike back or a replacement.

you know there something called police.

What a little bitch

I don't know your sister, but I already hate her.

I wonder how they'll react when you get other people involved in this? Because if they're okay with her stealing now, can't wait to see how they deal with it when she's arrested for stealing from a store. :)

What kind of bike?

Look at it this way; he may have your bike, but he ain't doing shit with it with the bum tire.