Can a relationship between sheep and rabbit work?

I am a female rabbit and my boyfriend is a male sheep we loved each other very much but his father has a heart problem and want make my boyfriend marry with someone else.If my boyfriend say no to his father then he will get angry and become ill and my boyfriend don't want to do that but he loves me a lot.what should I do in this situation?
Should I let him go?
According to prediction we are perfect match(90%)