I just can't believe it, girl
The speaker expresses disbelief about the ending of the relationship.

I can't believe that it's over
The speaker remains in disbelief about the ending of the relationship.

But I'm your man and I'll be alright
The speaker acknowledges his role in the relationship and reassures himself that he will be okay without the other person.

But still, the love we had stays on my mind
Despite his reassurances, the speaker cannot stop thinking about the love he shared with the other person.

Lately baby, I've been thinkin'
The speaker has been reflecting on his relationship.

How good it was when you were here
The speaker reminisces about the positive aspects of the relationship.

And it ain't the wine that I've been drinkin'
The speaker clarifies that his thoughts are not influenced by alcohol.

For once I feel my head is clear
The speaker feels like he is thinking clearly for the first time in a while about the relationship.

But early this mornin', ha, when I opened my eyes, ha
The speaker had a realization about his feelings when he woke up in the morning.

That old lonesome feelin' took me by surprise, ha
The speaker was surprised by how lonely he felt without the other person by his side.

I guess you meant more to me than I realized
The speaker realizes that he had deeper feelings for the other person than he previously thought.

And lately, girl, I've been rememberin'
The speaker has been reminiscing about their relationship again.

The good times that we used to share
The speaker is thinking back to happy memories in their relationship.

My thoughts of you don't have an endin'
The speaker cannot stop thinking about the other person.

And the memories of you are everywhere'
The speaker cannot escape reminders of the other person in his life.

But why should I tell you it's not your concern
The speaker reminds himself that it is not necessary to share his feelings with the other person.

You win some, you lose some, but I've lost and I've learned, ha
The speaker has learned from his experience of losing the other person in the relationship.

And at the end, I find, yes, I do [The love we had stays on my mind]
The speaker realizes that his memories and feelings for the other person endure.

Girl, if you were nearer
The speaker wishes the other person was closer to him.

If you had a mirror [Maybe you could count my tears]
The speaker suggests that the other person would see how much he is hurting if they were in his presence.

And if you were nearer [It would all be clearer]
The speaker believes that being close to the other person would make his feelings clearer.

How I wish that you were here
The speaker expresses his desire for the other person to be with him.

Baby girl, I was tired
The speaker is physically and emotionally exhausted.

So I laid down to dream for a little while
The speaker took a nap to escape from his thoughts and emotions.

But lately I've been so, so uninspired
Despite trying to distract himself, the speaker feels disheartened and unmotivated.

Without the comfort of your smile
The speaker misses the other person's presence and positive influence in his life.

'Cause that's how it goes / There's always some heartache / In this world I suppose, huh
The speaker acknowledges that pain and heartache are a natural part of life.

But you can't imagine [But nobody knows]
The speaker feels that no one else truly understands his pain.

The love we had stays on my mind
The speaker repeats the chorus and emphasizes the persistent nature of his feelings for the other person.