I know in the end I'm the only one who can make this decision but I need advice.

So we've been going out for a year and a half, he's my first long term bf and we're both 19. About a month ago I thought about ending it because it felt as tho we didn't have time for each other due to uni, I was losing interest and I was going through a shit ton of mental health issues. He showed up at my house at 1am bawling his eyes out and insisted I go home with him to talk. We discussed all the issues and for the next few weeks he worked on them pretty hard and it felt ok just not the same. I honestly love him very much but again this feeling of disinterest has set in and everything he does annoys me now. I don't even want to kiss him sometimes! He's insanely jealous if I speak to any guy and extremely controlling but I know he treats me better than anyone could. I've recently started hanging with this guy from work who has a crush on me and I've started developing feelings for him too but I of course haven't acted on them.

Basically I just don't know what the future holds and whether I can get anyone better than my bf and I'm just so young to only be with him for the rest of my life not knowing what else is out there. I don't think I would feel bad dumping my him but I know it would absolutely destroy him because he thinks I'm the only girl he'll ever be with. That of course would make me feel terrible. I just don't know