I feel like your perspective is an incredibly hard one to face, and I really want to thank you for sharing your thoughts on this right now. As mentioned above I'm in the opposite situation: within the last month I and my recent partner have found ourselves tumbling towards the first real relationship either of us have experienced. I must say, both of us are extremely cautious people, and we've discussed exactly what you mentioned: maybe what we feel will pass, maybe it will not hold up under stress, etc. Maybe our assumptions about our feelings are wrong in the first place. However, we mutually concluded we'd rather try this, live our lives, than have never tasted happiness. We'd rather try and fail than not try at all. I do believe that love exists and can exist, even if it hasn't for you. And I truly hope that you find it :)