she’s with him but says she loves me, so why after a year wont she leave him?

Agreed with the other response. If she is doing it to somebody else, there's no stopping her in doing it to you. Find someone who truly appreciates you and doesn't just use you as a back up plan. Once you move on and find someone who truly cares, maybe she will realize what she did was wrong and what she missed out on. This is not your fault in any way, so keep your head up. :)

Yes leave her, if she would do that behind his back like that, then she could easily do the same to you. NOT worth it. Just leave her.

She could be lying.. And you could just be the backup in case something goes wrong.. some women are little demons.. Twisting men around there fingers until they get what they want. You should leave.. She is possibly just using you for sex... And even if she isn't she has a boyfriend but she is playing both of you at the same time. Who knows there might be a third guy or a fourth... You deserve better hun.. Good luck to you. Make good choices

The fact that it's been a year is a red flag already. You're either her back-up plan, or another person who can give her the attention she desires. Some girls like to be fawned over by multiple guys and aren't girlfriend material. I would move on--you're doing what she wants. She wants you to stay and to be at her beck and call. Show her that she's not in control and that she's basically unfaithful and dishonest. I hope you find someone deserving of your attentions. She's bad news and I'm sorry for her boyfriend (unless he's playing the same games behind her back as well, and if that's the case, they deserve each other). Sorry I'm kinda like a repetitive post, but I just had to put in my opinion as well. Hope you don't mind. Just get away from her. If she really wanted you, she would've been with you in the first place and not crooning I love you behind her boyfriend's back. That's just fake.

What's the situation with her boyfriend? Do they live together, is she financially dependent on him, is he abusive, do they have children together? Are there legal ramifications of her leaving? Others have suggested that she could just want the attention/see you as a back up plan, and that's definitely something that could be happening here so don't rule it out.

But you haven't given enough details regarding the situation for a comprehensive response. So if it's just a case of she's using you for extra attention, I wouldn't stay.