You will if you don't seek psychological help. This problem is emotional and should be treated before you have severe depression.
Do you mean ST depression?
I think it is. You should be able to observe whether he is happy with you or not. If he continues to seek your company and do things with you, he must be happy with you. If he is avoiding you, then he probably is not happy with you. If you are aware of a problem but you don't know what the problem is, you can ask for an explanation.
There is nothing you can do. Your friend and your boyfriend are the ones with a problem. It is not your problem, so let them work it out. Or not. Don't worry or feel guilty . . . it is NOT your problem to solve.
Yes it is
Manic Depression
yes
Depression is a broad diagnosis. The patient is in depressed mood, and he/she loose the pleasure in most activities. A chronic physical health problem can both cause and exacerbate depression. When a person has both depression and a chronic physical health problem, functional impairment is likely to be greater than if a person has depression or the physical health problem alone.
The answer to your problem is DENT.
There are basically two types of depression. If you have depressing circumstances in your life (a failing marriage, bankruptcy, etc.) you can understandably react to them by becoming depressed, which is known as reactive depression. That is not a psychiatric problem, it is a problem in managing your life, and the solution to the depression is to solve the problems that are making you depressed. The other kind of depression has no apparent cause in the circumstances of your life, and is related to brain chemistry. That is a psychiatric problem and it can be successfully treated by the use of antidepressants.
The depression
Depression.
There is no blood relationship so this is not a problem.