Not taking medication or bipolar

My boyfriend of 5 and half years has been on 10 mg of Lexapro for the last 3 years. This was prescribed by his internist. He has never seen a psychiatrist. Things seemed to be going well on the lexapro until several months ago. But he now often fails to take the Lexapro and this makes him go haywire. He actually took 20 mgs a day for three days last week and then didn't take it at all for a day which caused him to become extremely negative and rude. He just does not seem to understand that he needs to follow the dosing instructions. He often drinks with the medication as well. Now I feel he is on the verge of a break down and he is trying to shut me out. He is always stressed about his work (self-employed) but I recently became aware that he owes the IRS about a half million in unpaid payroll taxes not to mention totally emptying his retirement account which had about $600,000 in it and maxed out credit cards of about $70,000. This seems like a hole he will never be able to climb out of and he doesn't seem to understand how it got so bad. I have convinced him to see an attorney for the IRS problem (which is potentially a felony from my research) and I have been trying to get him to see a psychiatrist to see if there is something else, like BPD going on. I am not sure that he will and he seems to be avoiding me as he frantically tries to deal with his work issues. I am debating calling his family who lives across the country to tell them what is going on because they have no idea and maybe have have more success that I am having. I know them fairly well but dont want to overstep my bounds. There is no one else here but me who has a clue what is going on and that is why I am concerned.