My b/f just started therapy 2 months ago and yes, at times it is harder rather than easier. He tried it 12-13 years ago but he wasn't ready to do it so it didn't last - not didn't work - didn't last. This time, he feels he's unable to run from himself anymore and even though therapy brings out emotions and memories that he doesn't want to think about, it's been done. The memories were always there, he just pushed them away by acting out all the time and drinking excessively. Now, he's committed to dealing because he knows it's the only way.
I personally think that therapy is always a good idea, but the right therapist is critical to help your boyfriend walk through the minefields. Be strong for him Crocyx, and for you. If he wants to stop therapy because it's "too hard" do everything you can to gently dissuade him; support him as much as he will allow and let him feel safe in the space the two of you have created. If he knows that no matter how hard it gets he can always find refuge there, it will help. If he feels a problem with the therapist, then encourage him to stop and find another one.
If his T is the issue, or even part of it, then therapy can do more harm than good.
Be well and have a Happy Holiday.
If you fall down 10 times, Stand up 11.