I do this a lot, but it's because I have abandonment issues and always feel lonely. Which probably stems from low self-worth.
I cling onto every relationship I can form, as the most important thing in my life. Regardless of how healthy it is or not. I wear blinkers, and am not prepared to take advice from anyone. It's taken a huge fall and immense pain through the implosion of a VERY important relationship to me, to be able to step back and realise how unhealthy the relationship was to me. And I'd been warned from day one - I just didnt want to believe it.
As hard as it is, you need to trust those people that really care for you (Off-hand I'd say your T and H are good bets) and listen to their advice. When you are able to take a step back, you can open your eyes and realise how right they were.
It may be painful, but it's for the best in the long run - please look after yourself. xx