My bf's ex has moved in with him?

So, firstly, sorry if this gets too long!
I want to say my boyfriends family are great - he has a 3 brothers, 2 of who met there gfs at 14 and 16, respectively and there still together & a twin sister who's been with her boyfriend for a year now, there good people and they take relationships seriously. I really like them but I do feel a bit like the new girl I guess cause... I am!
My boyfriend (who's 18 btw) broke up with his ex a year ago, quite amicably until then he'd been with her since he was 15. From what I know her parents died when she was 13 and she lived with her gran and his family really kinda took her under there wing, so even after they broke up she stayed really close to him and the whole family, she spent a lot of time with them. I'd met her a few of times.


So then her nan passed away suddenly (which is tragic and I feel really bad for her) and she called my bf like as soon as it happened & he dropped everything and went round (which is fine, I don’t have a problem at all! He knew her gran really well, and of course he should go, he’s incredibly kind and that’s one of the things I love about him!)

His dad then told her to move in with them cause she's got nowhere else (which is again understandable but means that now she's the 90% of the time rather than occasionally like before).

Then there was the funeral, obviously I didn’t know her nan but I went with Dane. And she was giving a eulogy but she was really struggling to do it so my bf got up and hugged her and he did it instead and then got caught up standing with her doing the whole thanking people for coming as they came and went so I was just sitting with his brothers & sister and there partners.
I wish I hadn't gone, I felt like people assumed he was still with her and wondered who the hell I was!
He said driving home...
Him: sorry I couldn't spend more time with you today. We broke up on good terms, I still care about her and I knew her gran well and she dosent have anyone else, you get that yeah?
Me: (what could i say?) yeah totally I get that, it's fine.
Him: I knew you would
We drove for a bit
Him: you don't like her though do you? (he was grinning)
Me: I don't not like her...we're just very different
Him: your not half as different as you think you are! It's all front - underneath all the bull***** she's not as tough as she makes out, she just pushes everyone away before they really know her that's why she ends up with no one! But I promise you in like 3yrs time you'll get on great!


So then on top of all that Dane works at a boat yard but mountain biking his passion and she’s a photographer, she does work for magazines and she’s somehow got this assignment on something mountain-bikey and she’s got him doing the tricks and everything, which again how can I be annoyed about that cause it’s his dream to make a living on his bike and its really good exposure for him but its, I dunno, it’s her and his project, and he talks to me about it cause he’s really excited about it, I guess its just another thing they’ve got.

I mean I know I sound like im moaning, which I guess I am, but I can't stress enough that he's great! he's so sweet and honest and romantic and easy going and a little bit shy.
But I have to have breakfast with my bfr and his ex while shes all "daney can you bring me juice" blaze as you like yet when we're sitting on the sofa and he goes to hold my hand or put his arm round me I feel awkward!


Put simply he's my fairytale guy but just sometimes I get this nagging feeling that maybe it's their fairytale…
I just feel like I haven’t got any options I cant tell his family what to do, I cant tell him not to be nice to this girl when shes lost any family shes got, what kind of b*tch would that make me – but sometimes I just feel like a bit of a lemon!