To create interest in sex, you can visit doctor to find out whether there is a hormonal problem. If it is okay, you may do female deer exercise. This will be a therapy as well as self pleasure. You may also practice kegel exercises. There is another exercise ,-circulating energy around, microcosmic orbit. Google these phrases to get details of the exercises. This will create a natural urge for sex.
This may be a temporary situation that will resolve itself in time. In the meantime, don't force the issue. Since you don't have any interest in sex with a boyfriend, avoid having intercourse for now. Instead, if you have feelings for him, give him a slow, lubricated handjob so that he will be satisfied.