Is it normal to miss your ex?

So my husband and I are going through a divorce. Long story short, there has been no communication, intimacy and my therapist says he's considered an alcoholic. (he doesn't drink everyday or even every week but when he does he blacks out and I'm stuck taking care of him and it used to be a lot worse and a lot more often) Anyway, for a long time I've felt lonely and unwanted. I begged him to go to therapy for awhile and he wouldn't go until I finally said I can't be married to someone who won't put in effort. Now we've been separated for a few months. I started hanging out with a guy (this only happened after we were separated, never while I was still trying to make the marriage work). He's sweet and basically is really great. He's very patient and understands what I'm going through,. He tells me all the time that he's not going anywhere. Where my ex lacks he makes up for and what he lacks my ex makes up for. But lately I've been thinking that if only my soon to be ex would've listened to my concerns and went to therapy I would still be with him. He's a great guy and I still miss him and my life with him. I know that he would attempt therapy but at this point I'm not sure if it could ever be repaired. Is it normal to start to miss him? Should I try one more time? I'm 28 so I'm not sure if I should Just move on. Has anyone ever come back from these issues? Especially being in a sexless marriage with no communication? My ex and I have the same vision for a future and same family values. Its just so hard starting over but im not sure if I'll resent my ex if we try again. I don't want to waste anyone's time, but I know someone will get hurt. Thanks. Please no mean comments, only honesty and positivity.