He sounds needy and manipulative and I think you already know what you need to do - end the relationship, letting him know that this isn't working out.

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Be firm - not cruel or crass, but firm and kind, and then block him on everything because he'll just whine and moan and threaten to kill himself (and whether or not he does is not your fault, that's the manipulation).

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I'm sorry you're dealing with that, but the best option is to really disengage yourself from that before he convinces you to stay and you have 3 children in a loveless marriage. Honestly, run, girl! RUN.