Stomach olsurs are more to do with bacteria imbalance in your stomach.
It's always been a known fact that it's got something to do with stress in life....But it's not. It's mainly genetic.
I have a friend who actually was diagnosed with it, however his father had it and was advised by his doctor that it is actually genetic.
Try taking some things that help with the clensing your stomach and help balance out the activity in your stomach and intestines.
Stay away from fatty foods, try to be more healthy when it comes to eating such as more vegetables.
And see your doctor to as they will be more helpful on this topic.

I don't think ulcers are in any way related to depression. My mother had ulcer some yrs back and as far as I know there was no reason for her being depressed at that time.
Anyway you have to avoid chilly and spicy food.
Moreover, look around for a new girl, there's plenty. Its a better option than to keep sitting and feeling depressed about the lost one.