I need some help if any of you can please tell me if its the pill...

I need some help if any of you can please tell me if its the pill that is doing this. I am a male 18 yrs old. My girlfriend broke up with me today.But it has been pretty awkward cause i was her first love and out of no where the past few days she was acting a bit strange. She got like depressed or something i cant even explain. she says its her not me but since she said she loved me out of nowhere she ends up breaking up with me and i could tell she was really depressed over nothing, she has gained a bit of weight she didnt even take the pill for that long maybe 3 months the most. i refuse to believe its the pill but then i hope it is cause then it isn't my fault or hers just the pill. My sister insist it is cause she went thought the same thing. so if any one can help me out a bit and tell me if should tell her to stop using it or to just wait it out a bit and see if she gets better. she also gets numb feets and cramps on her feet is that normal?? I'd really appreciate the help thank you.