Hi Needsomehelp, I need to read your posts once more but I wanted to give you a first feedback since you mention that you are feeling sick to the point where you are not able to function.
I recall what happened to a good friend of mine, almost 25 years ago. He got together with a really nice girl, who had however quite a bit of sexual history. I think all of us in this little circle of friends felt that “Luke” found a real special, nice girl, even if she had done some regrettable things in the past. Then, unfortunately, when they have been dating already for more than a year, some acquaintance visited her and somehow they ended up having sex. The girl (let’s call her “Irma”) was devastated, and my friend Luke was devastated. He probably felt like you feel now. Still, he stayed with her, because she was remorseful, and she truthfully came forward to let him know that she messed up. So anyway, fast forward some 25 years. They married, they have two children, they are happy together, and all of that heartbreak today is just a distant memory in the past.
Back to your case, take it slowly, one day at a time, by all means forgive her, and try to discern at leisure, with the help of spiritual advisors (priests) and mental help advisors, how to go forward, and whether you still have a chance of making this work.
It could be that her mind was playing tricks on her, once she went off her medication. She definitely needs to get back on her meds, because apparently those help her to stay balanced and to avoid doing hazardous things such as drinking too much, which directly led in this case to her losing her inhibitions and doing stupid things. It’s almost a textbook case that people with bipolar problems need to always stay on meds, because if they go off, they risk losing their inhibitions, they will do dangerous things, drink much, have promiscuous sex, go on extravagant shopping sprees, gamble away a lot of money, and the like. The human mind is like a machine, where the conscious mind keeps in check the irrational impulses of the unconscious mind. Bipolar people need medication to keep this machine running smoothly, for else they risk losing the ability of the conscious mind to always stay firmly in control, which is crucial for preventing episodes of lost inhibitions and hazardous behavior.
I would really love to see a happy ending to your present misery, since you say she is a great girl and you have been getting along well, previous to this trip of hers to Cuba. But take things slowly, one step at a time, and see where the Lord leads both of you. I hope and pray you can work this out, and you can stay together. I hope and pray she will be back in control of herself, once she is back on medication.
For now, take the first steps. Forgive her, and encourage her to get professional help, to get back on her meds. Also, you could benefit from a mental health professional helping you, don’t be too shy, or too macho, to seek out and accept help. In addition, do you have a good priest who would be willing to listen and advise you?