Why do I miss my boyfriend so much?

heyitssme
He's gone away to Wales for a week with friends, and I miss him th crazy. We've been together for only around 3 weeks and I knew him well before we started dating,and we have been keeping in touch by texting but it's just not enough. I just don't understand why I miss him so much and I can't wait to get my hands on him. Please help?
Why do I miss my boyfriend so much?
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