chihuahua urination problem

Question
I have a year old male Chihuahua that is not neutered yet. In the past 7 months I have went through a break up and have moved twice. My Chihuahua Ren has not been the same since the break up and three months ago I started seeing someone else. The problems grew from there. Ren started urinating in the house which he is house trained and hasn't went inside in months. My Chihuahua has always slept in the bed with me since he was young and now he is no longer allowed to sleep in the bed. Me and my current boyfriend share an apartment and  the problems have worsened in the past week. He urinated on a shirt that is my boyfriends and a jacket of mine that was laying on the couch. And today it was on our bed. I know the change in environment and people may be upsetting him but this can not keep happening. This is very upsetting to me because I think he is doing this on purpose. Any advice is welcome.

Answer
Get him neutered now.  Such behavior problems end any though of ever breeding him.  

Obedience train him.  He must learn you are in charge.  The key to most behavior problems is approaching things using the dog's natural instincts.  Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog.  Life is much easier if the 2 legged pack members outrank the 4 legged ones.  You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. Start at http://www.dogsbestfriend.com/  For more on being top dog, see http://www.dogbreedinfo.com./topdogrules.htm