Ex's

So I thought I finally I had my ex out of my life, but I guess not, I mean sure I still sometimes think about him and miss him, but he was bad and well abusive, so it's good I'm not with him.
Anyways he messaged my brother, asking how I was or what I was up to, it's been almost a year and I just thought I was free of him, I just want him to leave me alone!
Thankfully he lives in Australia so he can't get to me, but it still upsets me, so I just went on well facebook, and deleted a whole bunch of mutual friends because I don't want him checking up on me.
My mum goes "Well maybe you should forgive him. Maybe he has changed." He put me me down, and made me feel worthless, he may not have physically abused me but mentally and emotionally he did and that's just as bad, but she tells me to forgive him and be nice to him. I just want to never speak to him again.

Do you think I'm making too big a deal of this?