Me and her are both 16 and have been together for 1 year and 9 months. To be honest i had had thoughts of cheating and didnt see it as a big deal the whole relationship. She was at a really reallyyy low point when we got together, and she always said i saved her from that. What i did throughout the relationship was so horribly wrong, she is the sweetest most kind girl you could ever come across, loyal, loved me with all her heart, always respected my space but always wanted to be with me. I didnt realise how much pain i could cause her at the time. I didnt realise that me being the person to bring her out of her darkest point in life and then just completely betraying her like that would do to her, but i really really shouldve. I dont wanna lose her. Shes coming over soon to talk can someone please help me out. I always thought i would marry her and have kids. I didnt realise what i had lost til i had, and how much pain she is in could cause me to feel so so horrible n sad. I know i probably sound like a dumbass rn but im in a lot of pain n cant really think properly. I just need some advice please.

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TL;DR: I cheated on my gf (both 16) of nearly 2 years after saving her from her lowest and darkest point and shes coming over to talk soon