Shakespeare and Millay

"Let me  not to the marriage of true minds"
This poem speaks about true love. Marriage should be unbreakable. Couples should not try to fix something when alterations are found. 'love is not love which alters when it alteration finds,' This means you should not look for another partner because one changes. 'O, no, its an ever fixed mark' Implies that its something you can't delete (divorce) its always capable of being fixed. "Love alters not with his brief hours and weeks, but bears it out even to the edge of doom. If this be error and upon me proved,' I understand about that the problem between the couple of whom he/she is speaking of is that the partner spend too many hours working, and he/she says it can be worked on. I don't know if the speaker is male or female. The person speaking is the one who works a lot and is trying to convince his/her partner to not be upset that this problem can be fixed.

'What lops my lips have kissed, and where, and why'
I believe that the speaker can be a women because 'and what arms have lain under my head till morning;' usually women lay on men arms while in bed. She is pondering thoughts during a rainy night. 'For unremembered lads that not again will turn to eat midnight with a cry.' I believe speaker is talking about the men that she's had sex with presumably one nights stands. 'Thus in the winter stands the lonely tree,' 'I only know that summer sang in me' I believe speaker has gotten older and is not as attractive as before, which is probably why she is not so sexually active.