Why do I lose interest in guys after a few months?

Anonymous
I can never stay in a serious relationship because usually always around the 6th or 7th month, I lose interest in whomever I'm dating. I can literally be in love with them and have thoughts of marriage and then after a few months, wonder what I ever saw in them and plan on leaving. This really scares me because I don't think I'll ever get married or even if I do, I don't think the marriage would last very long.

Can anybody tell me why this always happens?

I'm almost 20 so I don't think it's pre-teen hormones taking over either ha ha.

But please, HELP?!?!?!
Why do I lose interest in guys after a few months?
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