My head cracked opened

I see him there looking just fine,
I haven't thought about him in quite some time.
Four years of good times we gladly shared,
So many memories and past times we came to bear.
If asked what I saw in the time to come,
The answer was him, there was no other one.
I never would imagen we'd grow apart,
I never dreamed another would someday have his heart.
Don't get me wrong the break up was clean,
We have still remained very close as crazy as that seems.
Still close friends but alas not like before,
As good as we can be, that's all I could ask for.
But now he's finally moved on and found another,
Asking permission and guidelines from someone else's mother.
I have to be honest hearing that makes me feel dead,
It's true the green monster is rearing its ugly head.
I moved on long before him, so why do I care?
To feel this way now, how can I dare!
He will always hold a place in my life,
And there's no need to shut him out purely out of spite.
I'm glad he's still around and I won't mess that up,
But seeing and knowing he's moved on, hurts so much.