I think you should evaluate the depth of your crush. If it seems like it will pass soon, then you don't need to tell Jake, it just seems like it will hurt your friendship. However, if it seems like something that will result in your friendship being hurt regardless (if it feels big enough to last, and deep enough that it will be hard to hide), I think you should tell him before your friendship gets too serious, so you can deal with it without him feeling like you kept this giant secret from him