Being single has nothing to do with it, and it actually could be harder for married men, which is contrary to popular belief.
Try not to focus on 90 days, its not about the 90 days but the journey we are on one day at a time. 5 days is a huge accomplishment, I remember when I couldn't make 12hrs, and now I am over a year clean. Its about the mindset more than the streak of cleanliness. If you have a 5 day streak then fall, do another 5 then fall, you just were clean for 10 days.
Keep it to One Day At A Time, and remember to get back up because dwelling doesn't really help us.