Never beg someone to love you back or be with you.
Never beg for someone's time, commitment, affection and/or attention.
Never beg someone to stay with you when you need them the most.
If they truly valued your company they wouldn't leave you or let go of your hand so easily.
If they truly loved you, they'd never let you beg for their presence and love in the first place...they'd just give it to you enthusiastically and with open arms. Don't beg.
It's demeaning and degrading.
Remember, if you have to beg for their time, it's probably not worth it anyway.
Nobody's love is worth begging for. If it's not given enthusiastically, leave it where TF you found it and move on toward a future where love is given freely and enthusiastically.