Is this a good idea? and any tips?

ok, so me n this girl went out for like 3 weeks and we took eachothers virginity and then i flirted with her best friend.. :/ anyway i have apologized everyway i could think of... i think i love her.. i cant get her off my mind. anyway now she talks to this guy and she says that she loves him and all but idk.. well she had a grease fire accident and her whoole body got burned and ive been feeding her and helping her walk and changing her gauze and everything. anyway i want to ask her back out by in a romantic way.. i have this idea. well this this lady who has land and its her friend and i first went over her house last week and its amazing her backyard is a big hill and on the top is a tree with a mistle toe bush and under the tree is a picnic table and i wanna take her there at sunset around 7 or 7:30 (when the sky is pink) but i also want to reassure her that she can trust me. please help me. oh and also last night she me n her stayed up all night and about 7 in the morning right b4 we went to sleep i fingered her for like 5 min. and she told me she loves me but she doesnt trust me and we cuddled and everything :/ i loved it i thought we were getting back together but when she woke up she told me she doesnt remember it :/. PLEASE HELP ME!!!!