I'm very sorry to hear about your situation.
If your case is affected by the Dublin III Regulations, Germany has to adhere to certain time-limits to make a "takeover request" to Italy. Do you know how far your case is already? If Italy has either approved the take-over/ hasn't replied within a deadline so Germany understands it as an approval, Germany has six months to deport you.
Please have a look at my answer from this thread for a more detailed explanation: Dublin regulation - when does the 6 months deportation limit start?
Have you already consulted a lawyer or spoken to a legal aid service?
Depending on how far your asylum case is, you may have time until the six months start (which would give you time to get married). But, as I'm not a lawyer, I would highly recommend to seek legal advice from a lawyer or a refugee support service!
Here is a list of pro bono legal aid in Germany: http://www.refugeelegalaidinformation.org/germany-pro-bono-directory
ProAsyl can help as well: https://www.proasyl.de/en/our-network/
I hope this information helps a bit, feel free to get back to me or the community if you need any more assistance.