Virgo Overthinking about Sagittarius gemini moon

HI, been reading the boards and I just thought maybe a fellow virgo could help me out!!!

I have been single for over 3.5 years, it was a tough split and I felt very broken after it, I decided to take time out and do whats right for me and if I meet someone in the mean time then great, although i'm as fussy as they come so I had dates but nothing ever gave me the gut feeling, butterflies etc.

Until August this year where I matched on a dating site with a Sagittarius with a gemini moon who lives on the next street from me, everything about her heightened my senses and I felt an attraction there, she was very flaky in her initial responses but when we eventually had our first date it was phenomenal, we were bouncing off each other, our humour was exactly the same, we share the same values and we both were very attracted to each other, and to this day we are still going upwards in our relationship, she is a very intelligent and successful woman in her career, yet there is a vulnerability about her too, 2.5 years ago she was diagnosed with depression and anxiety, she has had a pretty rough 5 years to be honest, wrong people in her life, wrong choices in her personal life which ended up in her having a breakdown, she feels very comfortable in telling me all this as she feels like i'm very protective of her and she thinks me being grounded and level headed will only benefit her which I like.

She is brutally honest as Sagittarians are I believe and that's good as I trust her because of it, However this is where my overthinking comes in to play, she admitted to me she occasionally does drugs with her friends, now I don't and never have, just a personal choice of mine but some of my friends do and it doesn't bother me but with her it does, I literally analyse it so much it drags me right down, I think of all these different scenarios that may happen but more than likely wont and it fills me with dread, when she told me she did it a few weeks ago with her friends I could feel my whole body just shut down from her and that scared her as I went from open loving guy to distant with a wall up, anyways we talked about it there and then and I felt a little better about it as she was being so honest, she said she will never do it with me in her company but cant promise she wont with her friends, I love her for her honesty but as you can imagine I just think the worst, I only overthink when i'm not with her, as soon as we are together my anxiety disappears.

I feel like we need to talk about it but also I don't want her to stop doing something for me, I would rather she does it for herself especially as how fragile her mind is, i just want to control this overthinking, things that may never happen and until it does then i can deal with it, do any other virgos know how to control this!!!

There's nothing to control, there is nothing you or me can truly control, you're an over-thinker is all. However if being an over-thinker gets in the way of your normal (daily) functioning or other aspects of your life, then I'd suggest you to look for help in how to deal with it, either through a psychologist/meditation/other counselling, etc.