Deal with this situation and its implications/ consequences for your relationship (hopefully only short term) asap.
Otherwise it will just get worse for you inside and then actually *be* worse when it is finally aired .
Worse still - you will feel "funny" about that bike which will sure take the edge off its coolness,newness,etc
Best of luck and remember none of us are perfect and all relationships have their crises occasionally and we learn from them (and then go on to have other crises and so on!!)
All you need is love...la-dee-da-dee-da...all you need is love!