Mental Attachment

I love a girl, and I think about her every time. She also loves me. But we cannot marry due to some reason.
She visualizes me everywhere and I also think about every time, everywhere?
Now I get some fear, we know that we can’t live all life together. I want to control my mind, is there any possibility for mental sickness in future?
Actually I am very involved with her, but due to our future. Can we manage ourselves in future?

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