'Watashi WA kanojo no kareshi desu'.
Kare WA watashi no kareshidesu
Watashi no kareshi/koibito (boyfriend/sweetheart) ha Jon desu.
Watashi WA kare o aishite
i have no stink'n idea!XD sorry.
If she has a boyfriend, leave her alone.
Kereshi means boyfriend.. or only boyfriend.
penisfied
'Anata WA anata no kareshi wo aishteimasu'. 'Kareshi' means 'boyfriend', if you want to say 'man' specifically you can replace it with 'otoko'.
'Koibito' when referring to a boyfriend/girlfriend, 'anata no ai' when referring literally to someone else's "emotion/feeling" of love.
君 (kun)
'kanojou' would be the exact, but when stating something like 'girlfriend-boyfriend', it would be simply 'kano-kare'. I hope I helped = )
To find a Japanese boyfriend a person can ask friends if they know of any single Japanese men. Other alternatives include online dating sites or go visit Japan.