boyfriend vs ex boyfriend

ok.me and my ex have madd issues. like last year through my whole fresman year we had these on and off stages; like we were on in november.off in december then back on in janurary to like march then I moved and we were off.and when I moved back.we started talking again.then stopped out of nowhere.we have a complicated history adn now we are going through another tlaking stage where we are beginning to be friends again;and im really scared im going to fall for him again;as I always do. and the thing is im currently dating his causin;and he telling me its not a good ideaa.and telling me how he stood up for me about something;and he basically kept asking and asking who my man was til I told him.me and his causin started dating yesterday.;and now its liike when me and him conversated yesterday. I just dont no what to do.I fell so hard for him;I mean the hardest.I;ll always love him.and I dont want him out of my life.dont tried that.and it reallly sucked.please give me some kinda advice.