you ask, if he doesn't love you, why he still holds you and why he doesn't leave you...
simple. he WILL leave you one day, as soon as his mom will find for him his future wife.. till then, WHAT does he loose having you? NOTHING... he is having a good time with loving nice girl.. why he would leave you NOW?. but when time comes, he will marry other girl, not you.
leave him..

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"What lies behind us and what lies before us are small compared to what lies within us."
Oliver Wendell Holmes