Are we more inclined to stay in abusive relationships? I don't mean to say were all the same but do our insecurities as women and men make some of us more vulnerable?

IMO No moreso than any cisgendered person who has dealt with abuse.

as quite a lot of us had difficulty getting into relationships in the first place I think its easier for us to walk away from a bad one.
The horrors that go on in some hetero marriages makes me sick.

Anybody, trans or not, who feels they need to be in a relationship to be whole, is in danger of getting abused.  Self-actualized people living their own lives (trans or not) not so much.

Well, I suspect we are fairly vulnerable as a whole - self esteem issues, fear of finding acceptance, quite a few of us are inexperienced relationship wise. This could make for an easy target for a controlling person.

Yeah, I think it does make some of us more vulnerable. Are we more vulnerable that other women or men with similar issues? I don't think so.