can somebody give me advise

[crista maria]

hi, i am canadian woman and i ve been here in uk with a 6 months visa and my visa will expire in 1 month and i ve meet someone here whos a british citizen and we want to get married and i want to know if
if i overstay 2 weeks and go back to canada and apply for fiancee visa, will i be able to get it and come back in uk ?
if he come to canada and marry me there how long will take for me to be able to come back here in uk and
what consequence will have in the future if i overstay here and want to marry later? thank you for ur answer. Crista

[vinny]

Why overstay?