moving on

It's been almost 2 months he's already with another girl(110% positive he left me for her) which shows how much he cared about me lol I just can't move on I can truly say he was my first love (not first bf tho) somedays/weeks im perfect and I know I'll make it but days like today I miss him so much. I'm young I'm only 14 and I know there's other guys out there and I'll be in Hs next year (he's already a freshman) so that'll make it a little bit more easier but he was honestly my rock that kept me together and now that he's gone I just feel like something's missing and I really need advice😔 thanks:)