What do i do

So i had been with my boyfriend for 1 year and 3 months. We fought alot. About little things. But we found our way back to eachtother. Not to mention hes broken up with me 2 times before. I just moved to a new high school due to bullying. My old high school was all girls. But now im at a co ed school where theres boys and girls. Now he had been struggling with me becoming friends with so many boys. It got to the point where i felt like i always hurt him and i was scared that i could be capable with falling for another guy. So i ended it but just telling him i need to work on myself. He thinks we are going to be together again, but i now know that i was right, im in love with someone else. I cant keep away from this boy, he cares about me, and returns feelings. But, i still have my ex, who im so in love with and dreamed of being with forever, I couldn’t imagine being with anyone else for my whole life. And im trying to hide back from kissing this boy but i dont know if i can, i still feel like its wrong if i did because me and my ex still talk about getting back together. he would be heart broken if i kiss this boy, but i want to so bad. Help please