If that's the only main Troubles between you two right now then definitely choose her over destiny. And I don't think she would mind if you still play destiny just not nearly as much as you do now, maybe squeeze in an hour a day or a few hours when she isn't a round or is busy or sleeping or something else. But when you come home tomorrow just take her out on a date or something and enjoy yourselves and forget about destiny and then continue from there and just give her attention. If there are lots of other problems accumulating then you have to think about if there are other big issues to why you maybe should break up. There is doubt in many relationships and usually It will pass after a while, just make sure for yourself