I'm very new to the whole marriage thing, in fact mine seems over before we ever really got going(long story, not important right now). Long story short I'm going to be divorced in the next few weeks(her decision).
Anyhow, the only wisdom I received from God during all the ugly splitting up, etc. was just to always tell her she was loved by me.
It didn't matter how bad a conversation went (never yelling, just sad), no matter how hurt I was that this was going on, I was a firm believer in telling her "I love you" whenever I felt it, but most importantly I ended every conversation with it.
She knows I don't say something if I don't mean it, and I never gave a lame, mumbled 'I love you' either. Say it like you mean it, and you do from what you have written so far.
It's not a sign of weakness or anything like that, in fact she hasn't returned any "I love you" in the last 5 months. I used to hope she would return it, but i've gotten used to the fact that she really doesn't plan to.
Believe it or not, it actually strengthens you inside to say it, I have no idea why or how that works, but from the bottom of my heart it's true.
It hurts, but when it's totally over I'll at least have the peace inside that she knew the whole time I still could have been hers, and that I have no regrets that I didn't say what mattered at the time. There is no doubt despite her leaving me, and all the crazyness of divorcing - she knows she was loved.
God luck - no, I didn't misspell that either
Sounds crazy, but try it - like I said, that was wisdom from God, and it helped me.