Third Eye Blind - How's It Gonna Be Lyrics Meaning

I think this song conveys the immense emotion and struggle the boyfriend has trying to decide if he will break up with his significant other of quite some time (his best friend, lover, soulmate, his air...). He's spent his 24/7 with this person and knows "her" better than anyone on this planet (and her, him) and, suddenly, everything will change and they won't "know" each other anymore. They won't even be acquaintances (for some time there after the break up) and possibly never speak again depending upon how the break up went down. Will they each move on, will the other find someone they are happier with--or appear to be happier with, will they do all of the same things you two did, will this new person replace you and suddenly be "the one"? It's a traumatizing, heart wrenching experience. The relationship had extreme passion and highs & lows and can be volatile at times. She is frustrated with the situation and the communication has become fighting rather than listening. He is at his breaking point and feels he needs to move on/ the grass is greener, but he DOES care and he says he wants to "get myself back in"--to me, he misses her and wishes it could work, but feels there has been too much damage to go back and continue; he is expressing his emotion struggle and turmoil between his mind and heart. He will never stop loving her--he cares--and she cares. It's a strange thing--a break up with someone you are so connected with on every level where you feel like one and it's drastically different. It's like a death of sorts, but if the other person doesn't miss you and just moves on it doesn't feel like you died (b/c you would miss that person then)--it feel like you & the relationship never existed and you start to question if any of it actually ever happened. Maybe the decision is regretted and you get back together, but the thought of that not happening is crushing.