What if my boyfriend is angry because I refused to offer him sex when he wanted it?

If your partner is pressuring you for sex, that qualifies as a form of abuse. Whenever someone tries to make you feel guilty for expressing your boundaries, reevaluate your relationship with them. Your needs and your bodily autonomy are important. You were right to speak up and refuse unwanted intimacy. If your boyfriend continues to act out because of this situation, talk about this with someone you trust and consider distancing yourself from him. Alternatively, see if he can consult a therapist about his inappropriate behavior and commit to respecting his partner's wishes. Above all, you should be in a relationship with someone who makes you feel valued and safe.