This guy and I are not in a relationship, but we just fool around. I think I have started to have feelings for him. But we have been fooling around for about 4 months now. Is it possible that a guy who just fools around with a girl, that he actually has feelings for her ? How do I get across that I want something more with him but not to say it straight forward and freak him out ? In a way that makes him want me to and makes him seemm interested. I feel nervous texting him because then he'll definitely know I like him. How should I talk to him about this?

Really appreciate some answers thanks guys!
I really might not ever have felt like this for anyone before...

Just tell him. If he freaks out, you don't need him in your life.

It may freak him out, but do you want a real relationship with someone, maybe him? You need to choose what you want for you, and don't let what they think control you.

You really need to tell him straight up that you've begun feeling more for him than just being friends with benefits. It will go one of three ways: first, he will admit to feeling the same about you (need I say more?); second, he will not admit either way, but will become increasingly awkward, in which case I'd diagnose him with commitmentphobia and move on; or third, where he will admit to having none of the same feelings and may or may not break this off to save your feelings in the long run. In any case, you need to take the leap, because although you may love his company now, you cannot continue in this limbo.
Another way of showing him without telling him (although with guys it is always best to be straight up) is to see a movie or go to dinner with him, 'just as friends', and see where that goes.