Can anyone give me advice?

so about a year ago i dated this girl (lets call her #1) , we broke up (not really sure why) and ive always felt like she coulda been 'the one', well finally i get around start dating again and im about to date this one girl [(lets call her #2) well #2 is #1's best friend o.O] well #1 comes back and says she has feelings for me and that night i go 'as friends' ta the movies with #2 and have a great time... but the next day i decide i still have feelings for #1 so we start datin again... now i feel like #2 got lead on (not intentionally, i was gonna date her) and now im thinkin about leaving #1 for #2 but i have REALLY deep feelings for #1 what do i do????