You can love someone and be bullied or be mistreated by them at the same time. A lot of us have toxic relationships that we cannot exit from.
Loving someone is one thing but allowing them to harm you is quite another. Understand the nature of the love you have towards a toxic person and realize your responsibilities towards them and vice versa. But never allow responsibility or your love for someone to confuse you into being mistreated. Separate your responsibility and your feelings towards a beloved from the responsibility and feelings for yourself.
And let your love for yourself be the first and foremost always. No one deserves your love like you do.
Remember that you are the fount of your own love. And you deserve to drink from it first and foremost.