To confess your feelings or just keep mouth shut.

Tell him. For your own peace if nothing else. Relationships are forever unless they grow together more from this point. I had a few girls in high school that had feelings for me and they never confessed, despite being close like you are to him. They told me years later, and if they only had at the time I probably would have dated them! Don't let the silence hold you down.

They say that the biggest regrets in life are the opportunities not taken. I can respect your feelings about not wanting to express your feelings for this guy and possibly hurt your relationship with him as well as put a strain on his relationship with his girlfriend, but I would ask you, could it be worth it? You say that you've been friends with this guy and over time your feelings have grown into something more. Have you been friends with him as long as he has been with his girlfriend? When talking with him (as friends) has he ever spoken of seeing a future with this woman? I would also ask a rough estimate about the age group we're talking about here. If you guys are teens or early 20s, it may not be out of the reason to make an attempt to at least open the subject with him to see if he feels the same. At this age, there are so many mixed emotions as we are trying to define who we are as an adult, in our personality, in our sexuality, in our vision of the person we hope to become, etc... Everything can shift so much from one moment to the next that your friend may end up in 2 or 3 "serious" relationships in the next year or two and each time this happens, you may end up in the same pattern where you want to tell him, but are too afraid to mess up his happiness, etc. But, I ask again, could it be worth it? Love is a beast that knocks around the walls of your chest in wild frenzies wanting to be free, but we cage it with good reason, because the harm it could cause is devastating. But, the joy it could create is so much stronger that we let it loose in spite of our best efforts because it yearns to be connected, cared for, a respected. If you feel your love for this man is so bold that it can barely be contained, then the right thing to do may be to just let go of your fears and tell him how you feel. Yes, this could cause pain, awkwardness, and ultimately change the way you are with each other, but if you feel that the possibility of him saying he feels the same is so joyous that you can't dream of anything more wonderful in your life, then better to throw caution to the wind and tell him the truth no matter what may come, because if your feelings are true then they will never go away and going on like this will eventually ruin your relationship as much as if you just told him in the first place. Of course, this is up to you, so I wish you well on any decision you make. Peace.

I think you should control yourself from falling with him . That's a difficult situation to be in , in case he also falls for you because you will be hurting his girlfriend in the process.

As you said "I'm never the type that rocks a relationship just for my own destitute.". From that, I think you know the answer to your discussion title :)

don't lose your hope.

Instead of telling him directly , you can just give him some hints that you like him. You never know. He may like you too. I have seen a similar case with my friends, they both liked each other but they didn't tell each other. And like in your case the guy was dating an other girl because he didn't want to lose his friendship with the girl. But finally now they're together. So go try. ..

Stop! unless you want to break your heart. Time to move away and find the right person.. they do come in many packages.