Do you feel like you're "cheating" on current T if you see T1? That's how I have felt with T and L... and even J. But both T and L have reassured me that they only want what's best for me, and only I know what that is. I have had a couple of sessions with T and monthly emails, and L is not upset or jealous or feel slighted. She actually wants me to maintain a relationship with T. And T didn't feel cheated on when I decided to have L as my long-term therapist. T also offered that I could come back if I ever needed or wanted.

You don't owe current T anything. If you feel you need or even want a session with T1, go for it. If you decide to return to T1, there's nothing wrong with that. If current T jas a problem, that's her issue that she needs to deal with.

That's my opinion anyways.