Getting back in touch with an old friend

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>be in a weird relationship with girl in HS
>on again off again dating
>basically each others best friends and then suddenly we wont talk for a month or two
>had been slightly sexual with each other and i was pretty obsessed with her
>the last time we ever saw each other was graduation and it was pretty frosty
>she removed me from her FB friends and blocked me for a solid 3 or 4 years
>unblocked me a couple years ago and sent me a friends request a few months back
>added her but havent talked
>not really interested in her anymore, but we WERE really close friends and shared with each other secrets we really never shared with anyone else
>sometimes have had dreams about her randomly, just her as who she is. me and her hanging out. nothing sexual or romantic
>ill wake up and have a desire to reach out to her to see if we couldn't be friends again
>never know what to say without being awkward as fuck as the last time we saw each other we were basically mortal enemies

so how the fuck do i do this adv