How can I share a house with my best friend after she helped herself to my ex

DEAR DEIDRE: A FRIEND said she was helping me get back with my ex – but then bedded him herself.

She had sex with him at the first opportunity, in my bed.

I’m 20 and studying Spanish. I met my boyfriend during Freshers’ Week. He’s 22 and to me, was sex on legs.

We dated for most of the first year but towards the summer holiday we started to argue. He started putting his mates, drinking and playing on the Xbox before me.

When my protests turned to nagging, he dumped me.

My best friend, 21, tried to persuade him to take me back but he said he’d moved on.

I threw myself into my studies then went on a placement to South America for the course.

My friend said she’d take care of my house plants, so she had a key to the room.

I returned after six weeks and the plants looked great. But my bed wasn’t made and there were stains on the sheets.

I asked her about it and she said she’d got drunk one night and got together with a boy, but couldn’t go back to her room as it was such a mess.

She offered to do my washing and apologised, but I did feel pretty disgusted.

Another friend then told me she’d seen this mate and my ex-boyfriend coming out of a club and they had their tongues down each other’s throats.

I confronted my ex and he admitted they’d had sex. I can’t even be in the same room as her, let alone look at her.

How could she do that to me?

The worry is, we are due to be sharing a house next year.

DEIDRE SAYS:  I’m so sorry.

These are the people you’d think you would be able to trust.

You’ve dodged a bullet with your ex-boyfriend. He showed his true colours by putting you low on his list of priorities.

Is that what you’d want for your future?

Your friend has shown she has little regard for your friendship.

You would feel happier finding a new house and trying to find a different student to take your place in your original accommodation.

My support pack called Mend Your Broken Heart will show you where to find support.

Pictures posed by models.