Mentioning suicidal intent is seen by a therapist as an aggressive move (even though it might be just honesty.) The therapist distancing you is pretty common. Just understand that if he perceives it as a gesture that's trying to manipulate him then the appropriate response is to not engage in that game.

I would ask him very directly if he thinks you're trying to manipulate him with the revelation. Tell him that's not your intention. Also mention that you feel a distancing and its hurtful.

Just say whats on your mind here, next session. It will be okay one way or the other.