Firstly your boyfriend is being unreasonable to put pressure on you in this way. He should be supporting your course and your decision.
If a PGCSE the same as a PGCE, is yours School Direct or more university-based? If it’s the former it might feel busier as you are likely to have a fuller teaching timetable and more “responsibilities” from early on.
Are you already teaching and now getting the qualification, or totally new to it? You’re likely to find it more full-on if it’s all new.
Would the holiday fall during term-time or school holidays? If it’s term time you obviously can’t go anyway. If it’s in holidays, which would it be? (If it’s close to exams you might be asked to do holiday intervention. It wouldn’t be compulsory, but you might want to if you have students taking exams and feel invested/responsible.) Or, you might want to take up the chance to accompany school trips during holidays.
Do you know anyone who is already on the same course/at the same placement schools to get advice from about what it’s like in practice?
Although my School-Direct PGCE was full-on, I’d already been teaching for a while so it’s not directly comparable. But I was glad to go away on holiday during some of the school holidays (I did have to do some work but jigged it so it was just the essays/paperwork, having kept vaguely on top of marking during the term). I also had to be on email as I was also in charge of a subject, but It was still good to have a break.