I managed to marry two alcoholics and I do know unless they accept they have a problem and want to change there is nothing you can do.
I think you are right to recognise that you love them but you do not like them and you do not deserve that life. I think you have to look after yourself and do what is right for your own mental health.
If they want your support to get treatment / help of course you do what you can.
My first husband died an alcoholic the second got treatment and stopped drinking but it took him 3 or 4 tries. We divorced.