I apologise in advance for a boring story 
So this guy has been causing me and my current gf grief for a while now, He's sort of a friends friend. Basically before me and my gf got together last year she'd been on a night out and snogged him, nothing more. He then obtained her number and started texting her asking when they were meeting up again, she said she was sorry and wasn't really interested and that was that.
About a month later I started seeing her, but we then kept running into him on nights out, he'd come up to her and ask for a kiss or say when are they going to meet up. She rejected him every time, if a little on the kind side. He still kept doing it so i decided to confront him about it, he said that he didn't know that we were going out and that he would lay off, a lie as she'd told him several times she was with me.
The same night I confronted him he waited for my gf outside the toilets, as she left he pulled her to one side and started telling her he loved her and couldn't believe she'd cheated on him
He then left when I came looking her. Since then we've run into him several times in town, He acts all friendly towards me but as soon as he see's my gf alone he starts asking her to come back to his house and that she should leave me for him. She's told him to get lost every time and come to find me, however he always leaves before I find him.
Now last month on my birthday he did the same thing but was all over her, again saying stuff like come back to mine, and even said 'I can't belive you cheated on me with him'. I turned around in time to see her push him away and for him to then grab hold of her, I ran straight over and pushed him off and was honestly about to engage in fisticuffs before the bouncers stepped in. Since then i've had some of his friends come up to me and say that he's told them he's been seeing my gf for months.
My gf went out with her mates at the weekend and had him following her around all night again, saying the usual come back to mine and he dosen't need to know stuff. She tried to get rid of him but in the end decided to leave town and come to mine, he then started ringing her so I answered it and told him where to go.
No doubt he's gonna try something again when she's out, and if i'm there i don't know how long i can stay calm, he makes me that angry.
Sorry for my long boring story
Any advice what to do?

So this guy has been causing me and my current gf grief for a while now, He's sort of a friends friend. Basically before me and my gf got together last year she'd been on a night out and snogged him, nothing more. He then obtained her number and started texting her asking when they were meeting up again, she said she was sorry and wasn't really interested and that was that.
About a month later I started seeing her, but we then kept running into him on nights out, he'd come up to her and ask for a kiss or say when are they going to meet up. She rejected him every time, if a little on the kind side. He still kept doing it so i decided to confront him about it, he said that he didn't know that we were going out and that he would lay off, a lie as she'd told him several times she was with me.
The same night I confronted him he waited for my gf outside the toilets, as she left he pulled her to one side and started telling her he loved her and couldn't believe she'd cheated on him

Now last month on my birthday he did the same thing but was all over her, again saying stuff like come back to mine, and even said 'I can't belive you cheated on me with him'. I turned around in time to see her push him away and for him to then grab hold of her, I ran straight over and pushed him off and was honestly about to engage in fisticuffs before the bouncers stepped in. Since then i've had some of his friends come up to me and say that he's told them he's been seeing my gf for months.
My gf went out with her mates at the weekend and had him following her around all night again, saying the usual come back to mine and he dosen't need to know stuff. She tried to get rid of him but in the end decided to leave town and come to mine, he then started ringing her so I answered it and told him where to go.
No doubt he's gonna try something again when she's out, and if i'm there i don't know how long i can stay calm, he makes me that angry.
Sorry for my long boring story
