How to deal with past issues so I don't ruin my current relationship! SOS

Ryanda • 28 no kids happily taken ready for baby #1
I am in a relationship with someone who loves me for me and does everything for me he has never hurt me or called me names or done nothing to me (I have tried to kill myself therefore somethings had to be done) and yet I put him through hell due to past relstionships. Please help me