How can I safely leave a boyfriend I love but don’t feel safe with?

I’ve been dating this guy for almost 9 months, I love him so much but I honestly don’t know why. He has a drinking problem and everytime he drinks he does really dumb stuff I’ve caught him liking other girls instagrams, stalking he’s ex and other women he’s been with. But I can’t build up the courage to break up with him. He tells me he loves me he comes to see me he tell me things are gonna change and he’s gonna stop drinking and Focus on us but I don't know if I should just give up on us and move on. I have a really big fear of being alone because before I met him I was alone for 2 years and I felt so lonely and sad. It’s nice to be held and loved but people say real love is supposed to feel like home but I didn’t grow up having a nice home environment so what does real love really feel like? And will I ever find it?
How can I safely leave a boyfriend I love but don’t feel safe with?
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