2 year relationship and he's cheated? Would u get back with him?

Hey girls!
​Me and my ex were together for 2 years &he's told me that he slept with another girl on my birthday while arguing on Boxing Day!! He kept this a secret from me for 7 months but I love &miss him too much to move on. I've been speaking &dating other guys but they just don't help with anything. He told me he didn't mean it& hewas young (16)& he'll never do it again. What should I do? 

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