Hello AlicC, can we offer a warm welcome to the site, and feel so sorry that your relationship has broken up and whether or not it's been caused by your own mental disorders is not easy to say, simply because we don't know how your boyfriend is feeling about the situation, nor whether his family have an influence on his decision.
It's also very difficult to know why you have begun to feel left out, at the moment that's why you need to find out why all of this has suddenly happened, and by no means are you to blame.
Living with his family may be good so you can save so money, however, living under their rules and regulations isn't pleasant, especially if you don't accept what they ask from you, and if this has happened then it can cause you to be feeling this way.
Your comment is only brief, which is good, but there are many points in it that I'd like to extrapolate on being careful of what I'm allowed to say and one is also the breakdown of your dad's marriage and wondering what to concentrate on, yourself or your dad, but first of all, you need to look after yourself, only because then you will be able to and strong enough to cope with these different situations.
We always wish we could handle all of these different complications, but this perhaps is better done when we have help from a counsellor.
We really hope you can come back to us because there is more we can discuss.