I never want to go out with my friends but he wants to go out with his.
That's your problem, its not his.
Get help for your depression and PTSD (have you actually been diagnosed or are you diagnosing yourself?) and get a social life outside of him and you'll be much more happier. In fact, if you get the help you need for your fear of being alone and your codependency then you'll likely not even "like" this guy never mind think you "love" him.
Work on you first and the rest of what you should be doing to be happy in all aspects of your life will follow.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion