The relationships I have with friends or family all seem to be normal, with standard feelings of joy with good time spent, or reasonable amounts of anger when it comes to being let down, but never any overwhelming feelings. 
However, when it comes to a significant other/favourite person, the feelings tend to be intense, where good times could be felt as neverending sunshines rainbows and sparkles, but when I feel like I'm being ignored, the urge to spiral out of control and use verbally abusive language over the perceived betrayal / potential abandonment just exists, overwhelming my emotions and makes me wish to cease existing.

I'm tired of feeling this way.