@Erzengel & Anita: good advice indeed. My father is a former psychiatrist so he told me that he's seen a lot of girls like that and they usually never change, keep repeating the same patterns all the time.
She used to joke (not really

) sometimes that she needed to see a therapist because of how much of on a rollercoaster she is. I was there as much as I could long distance (although like I say, I was in France, she was in England, so not that far, but considering she was teaching, we'd have had like one day together tops, there was never any time), she wanted me to be there, she had a few friends over there but is very close to her family and she had a hard time being away from us.
To show you the extent of the depression, early January, she was so happy that she was going to have 4 to 5 days off and wanted me to spend those with her over there, she even had a teacher friend of hers who was willing to leave her her house while she went away, I remember her telling me about it on Skype, so elated.
Then, the depression slowly surfaced more than it used to (I used to see those moments when she allowed me too on Skype), she was tired all the time (depression indeed), would get sick, went to see a doctor.
About two weeks after wanting to spend all this time with me, she says she needs to be alone for a while, that we're not looking for the same thing, that she's going to come home for those five days off because she's not feeling well.
So yeah, I know in a way I've been trying to save her, but now, she seems (once again, I only saw her once two weeks ago) much better, she has a job here now, her family close to her, her friends (that are very important to her, and that I do not like by the way

). At her core, I think she's still the same way though, I don't know if she's still with that fellow, I don't think so though.