Unknown to myself…

So… My main problem in life isn’t that of feeling left out, not that I don’t fit in although both of those are very much good reasons to be depressed. Anyways, my problem lies in my relationship, not with it but about it. I have kept a sort of diary or blog type thin on my phone over the nearly 3 years and as you read them from start to finish you see it go from sweet and cute to doom and gloom. Now I am a 16 Year Old male and I am extremely unhappy in which I sometimes result into self – harming. Now aside from the small story’s I’ve put on here ill put what s really the problem. I love my Girlfriend with anything (nobody can say any different) the 3 years we have been together have made us best friends but I find recently also worst enemies. She does not trust me for reasons that seen to me invalid and it seems that she only seems to consider her own thoughts although she said she doesn’t. It’s just such a depressing thing knowing you love someone an could never leave them when it seems like everything is goin to hit. I often day to her at a point where she would say why don’t I break up with her that she will the one to break us up because I could simply never do that. Now I’m asking if there’s any ways anyone knows of to help deal with this and I know I’m not a person with a major issue but from the amount if stress these arguments cause I often find myself pondering over suicide and how I would do it. Thank you all, but I want to add that my story is one of many more on here and I am currently not in the most of need so please don’t feel like I just want attention because I don’t. I want help.