I can't stay wet?

It had been a week or so since me and my boyfriend had sex and last night we ended up having sex three times throughout the night but it's ended up hurting myself and him as I was wet at the start but it just completely stopped once we started?
we even tried to use lube but if anything that made it worse and it felt really uncomfortable! 
I was always really wet before we started and slightly into sex but then suddenly so dry. 
I have implanon and I don't know if this effects it? Has anyone else had this issue or just random issues with being wet?

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