Long story ahead, but please read :)

So, last weekend I hung out with some of my old school friends. i'm 23 and live interstate so barely get to see them while college is on.
the 4 of us hung out all night and had such a fun night and a couple of drinks, no one was drunk though.
When it was bed time we all hung out and then the other 2 left for bed. 
X (lets call him this) and I stayed a bit longer and talked. talking led to cuddling and laughing and then next thing his hands were all over me..(and mine on his). we didnt kiss or have sex or do anything sexual apart from touching and hugging and teasing. but damn the sexual tension and chemistry was on FIRE. I knew I didnt want to go any further, not while i'm still seeing current bf.

BACK story, him and I have had incredible sexual tension for the past 10 ish years, but never acted on it. it was either the wrong time or I was seeing someone or he had a gf. 
we've always talked, sometimes have gone months without talking, but then when we talk its like nothing has changed. 

SO, back to the story. I'm currently seeing someone 1.5 yrs strong. We had an amazing first year , but its gone severely downhill. He is needy, insecure and sulks when he doesnt get his own way ( he admits all this..) 
He doesnt like when I go home to visit family or am away on uni trips for my course.  He feels the need to message me 100 + times a day. Hates when I dont reply, etc...

What do I do. 

I think the fact i've even written this means, i should probably break up with him.
He deserves someone better, who wants a close  and needy dependant relationship. I dont think I can ever give that to him.