I guess this has to do with someone cheating on you, and I am sorry for that. Been there, but this was an alright poem. It was short and sweet, but I think you could do more with it. Way more. Make it have more depth and detail...which help people understand better. I understand, cuz I have been there, but I don't know if anyone else does. This isn't a bad poem....just needs a little work.
Praise: maybe the best language ive seen in any of your poems. good idea too, with the ashtray. it provides a solid image of some painful ending to some relationship. personally, i don't need the specifics - but do consider telling us the type of relationship. 'closing the coffin door' adds the right tone - an ending comparable to death.
Overall: the best of yours i've read. i see a consistency in your poems - sadness. sometimes you throw in a sweet sadness, which i always like.
In addition, we can tell much about the artist by their art. This is not to say that if a writer puts a child molester in his story that he wants to fornicate with children - but it gives an indication to what the writer/poet is feeling.