Hello, Vico!

This is never an easy situation to be in, especially since you have been with your boyfriend for such a long time.  I am sure that by now, you have developed a level of trust in him and feel that what he does illegally can be overcome by your "love" for him.  I work with a lot of young people and I always ask them, "What kind of life do you want for yourself?" and "How much does your boyfriend really 'love' you?" so I am asking you to ask yourself those same questions.

So, let's take a look at the first question: "What kind of life do you want for yourself?" I can tell you from personal experience that if your boyfriend is involved in illegal activities right now, he is setting himself up for a destructive future.  Young ladies have to be very careful about the "lies" that we allow ourselves to believe out of the mouths of our boyfriends.  What information has he told you?  Is this just his "way to make it" for now, but will "get out the game" when the time is right?  If so, then I would recommend that you spend some time apart until he gets "out the game" (whatever that may be).  Understand that you could easily become "guilty by association", putting yourself in a situation that could become detrimental to your well-being and future, just because he is involved in that lifestyle.  If you don't desire to spend your time now and time in the future inside of police precincts, worrying about whether he will get caught or arrested while you are with him, or having to talk to him through a telephone while looking at him through a plexiglass window, then I would recommend that you find a way to break away from him because that is where your future is headed if he continues his illegal behaviors and you stay with him.

So that brings me to question #2:  "How much does your boyfriend REALLY love you?" It seems that you are willing to risk your well-being and livelihood to stay with him, but how willing is he to change his ways to stay with you? This is a great way to test a man's love for you and his character. Letting go of his illegal habits and making good choices for himself is in the best interest of both you and him and would prove to you that he really cares as much about you as you do about him.  The reality is if he does not want to improve his life for the sake of your relationship, then he does not deserve to have you and you need to let him go.  It may be very difficult for you to do, but in the long run, you both will be better off.  
 
I wish you both the very best!

you should break up with him because whathappens if he does something really illigo and gets you into trouble

There is others to love boys come in the future, more to come more to love brake up with him b/c you never know you could get hurt to just by being his girlfriend!  Just an idea think on that let it margnate it is a very hard thing! 5 years is a long time ask him to stop if you really care so much tell him how you feel!