Can my partner throw me out of his house?
No! Legally, it's her home, too—even if it's only his name on the mortgage, deed, or lease. It doesn't matter whether you rent or own, your spouse can't just kick you out of the marital residence. Of course, that doesn't mean that, sometimes, for whatever reason, it's not better to just go ahead and leave.
Is it okay for my boyfriend to keep pictures of his ex?
Because it's a good idea to let your partner know you still think of the ex and want have keepsakes from them. That your love for them isn't enough to rid themselves of what no longer is. Keep the memories, not the objects.
Is being friends with an ex a red flag?
Having a partner who's friends with an ex does not have to be a roadblock in your relationship. If, however, you have concerns or have noticed any red flags, it is valid to want to follow through on that.