What you will need: 1 x knife, 1 x ring, access to a sunbed, the ability to grow a beard.
Place the ring on your wedding finger for a month.
Stop shaving and use the sunbed to gain a tan.
After a month when your beard is full and your tan is noticeable, remove the ring from your finger.
Remove all your clothes and break into her house.
Use the knife to cut your body in various places. Avoid the face. If possible, focus on your back. The more blood the better.
Enter her bedroom and lie face down on the floor. Wait for her return.
When she enters the room pretend to be unconscious. Allow her to turn you over and try to wake you for a few seconds before you open your eyes. The injuries to your body will serve as a distraction to your nakedness. She will be more concerned about your wellbeing instead of fearing the naked man in her room.
When she asks you what's happened you should ignore her questions. Instead you must act confused and ask the date. If it's September 15th she will say 'September 15th' to which you must reply 'No, what year is it?'
Upon hearing the year say the words 'It worked.' Pretend to lose consciousness again for a few seconds, implying that whatever it is that has worked took a great effort.
If she is a curious person she will probably ask 'What worked?', even if she doesn't ask this question it is important that you now say the words '(Insert Her Name), I'm from the future' in your most deadpan voice.
Raise your left hand to your face. All women are very observant, so she will immediately notice the tanline on your wedding finger. If she is imgaginary enough she will realise that you are married and your ring has simply disappeared, because clothing and other items cannot travel through time. Your nudity will support this.
Now comes the hard part - The monologue. In your own words you must give a speech in which you mention all of these key points:
a) You are married to each other in the future
b) Her previous boyfriend was dead
c) In the future your relationship is not going well
d) You've come back in time because you can't help but feel that she would have been happier with her previous boyfriend if he hadn't been killed
e) Her boyfriend is going to be hit by a bus while on his way to a date with her 12 months from the present. They should not go out on that day
f) The current version of you will soon disappear because you have disturbed the time space continuum
Get to your feet and go to kiss her goodbye. It is important that you do this with the confidence of a man who has done this to her many times.
It is possible that you would have sex with her right away. You're naked, kissing her, in her bedroom, agreeing to destroy yourself to make her happy. And as far as she knows you've had sex many times in a future that will no longer happen, so she thinks to herself that maybe she should have one memory of it.
After having the sex, ask to borrow some clothes then leave.
Clean yourself up and randomly bump into her a couple of months later.
There will be three possible outcomes:
1) She asks you to marry her.
2) She walks away as if she's never seen you before.
3) She calls the police, and you're arrested on rapist charge.