its only been like 3 months but iv demonstrated a lot of value and she says she is in love with me a lot.

ill explain briefly, she is a solid 8, dancers body, semi finalist miss England, average in bed.

its time to leave her (been cheating too much, its just not fair), would actually love to still be friends but im sure im in too deep for that.

any advice? what to say? how to put it? what not to say?(obviously i'm going to leave out the cheating)
long winded deep conversion? or do it quick and hang up the phone (like ripping off a band-aid)

she lives a long way away from me so that's going to be my main reason and the reason im doing it over the phone like a pussy.

Get her face to face, be direct and let her know that you want to break up. State your reasons why you want to break up and that you think it would be best you don't contact each other for awhile so you have time to get over each other. She'll probably cry but console her but stay FIRM with your decision and don't bend on it, wish her the best and be on your way.