Ahh boy problems hellp?

wel tbh,ive been in love wif a boy for about 5 months now,and we went out for a month and 3 weeks and then we split up for no reason he just dumped me.and ive been loving him evre scince and he always gives me mixed signs like somtimes he talks to me loads and then like flirts wif me and somtimes he like flirts wif this other girl hus his best friened but she loves him the same way i do but obssesivly and like,he is ALWAYS with her.:/ but he says he dosent love her but it seems like he does,and he always looks at me and trys to get my attention,it was 5months ago we split up and i just want him back burr i dunno what to do. help? :/