Dating someone with depression

He’s constantly sad and insecure... he tells me about how he used to be suicidal and every now and then the thought comes back, and he says I’m the best to ever happen to him and that he hasn’t done anything to harm his self for his mom and me but he’s not trying to victimize his self if I ever leave him..

I feel a big weight if I do something wrong or bad he might do something and I don’t want that ..

idk it’s complicated but I’m always there for him and bottle my feelings because he already feels bad, idk how could I help him?

Comment your experiences if you dated someone with depression/advice thnx