She loves me but has a boyfriend?

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I'm 17 she's almost 16. Basically we've been speaking nearly 2months, she lives 45minutes away we haven't met yet. But we basically text 24/7 and speak on the phone or on Skype every night she's actually amazing she likes what I like shes everything I like in a girl. I care about her so much and she's the same for me she says how amazing perfect I am etc, we always say we like eachother instead of love eachother but she's accidentally told me she loves me a few times. We agreed to say 'I like you' until we meet up cause saying i love you to someone you've never met feels weird for me. So yeah we basically have been in a relationship for 2months not official of anything cause we haven't met then yesterday i was looking at who she follows on Instagram and saw a guy who uploaded a picture with her saying they're bf/gf and have been for 11months. So I confronted her and she rang me instantly admitted everything told me how she feels basically her relationship was on the rocks when I showed interest and she didn't mean to fall for me. And she actually tryed telling me she had a boyfriend one night on the phoneshe sai Callum I have a boyfriend And I reacted what are you serious like anyone would and she said she was joking. So she tryed to tell me but couldn't because she was scared of losing me.

Now I don't know what to do? I wish I could cut her off but I can't I care about her to much. So what do i do? All opinions are helpful sorry it's long