definitely small claims court. it doesn't matter about his income under the table. he owes you! i'm afraid he used you in the relationship and he prob doesn't plan on honoring his debt unless you take legal action.
i'd contact the oxygen tank company to advise them you will not pay for the rental and cancel your credit card payments hereafter. advise the tank company of the situation, his obligation and where he lives. this may not work but i'd try it if it were me.
hopefully you'll be wiser in the future when dating someone. yes, he preyed upon you big time. then you allowed it.
best of luck to you.
welcome to pc too! 
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Do not let your fire go out, spark by irreplaceable spark, in the hopeless swamps of the approximate, the not-quite, the not-yet, the not-at-all. Do not let the hero in your soul perish, in lonely frustration for the life you deserved, but have never been able to reach. Check your road and the nature of your battle.
The world you desired can be won. It exists, it is real, it is possible, it is yours..~Ayn Rand
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