The main thing my T taught me was that you don't have to be nice to anybody.That it's okay to put yourself and your needs first and this applies to you too. You don't have have to answer his messages if you don't want to. Block him and don't think twice about it.

But I would also suggest seeking out emergency contraception and visiting a sexual health clinic to get tested, but it usually takes around 2 weeks for anything to initially show up.