What's made you decide to go into therapy just now? You say you have unresolved trauma but unless it's causing you difficulties in your day to day life, it may be resolved *enough* of that makes sense? There's nothing to say that therapy is the only, or even the best, way to resolve issues, now may not be the right time for you or he might not be the right person. If there are things just now bringing you back to therapy, talking about those might be a good starting point, that discussion may lead you to deeper issues, the trauma you referred to or not - it's your choice.

What makes you feel like you need to delve into your past or into traumatic stuff - it's not always necessary or even beneficial but if you feel you do need to, then finding the right person is important.