OK today me & my boyfriend went to the movies and sum times we use each others phone and write messages on a blank text pg so this time we were using his phone... now before we started writing back and forth on his phone he kept getting text messages and every time he answered them he kind of tilted the phone so that I shouldn't see & I acted lik I wasn't interrested I always do because I try not to be invading and I want to be able to trust him so were sitting there watching the move and a sexy scene comes up and he takes his phone writes a message on it and passes me the phone we were kind of sex textin a little bit I made a mistake hit the end button so I had to pull the text screen back up and the part before you get to the text screen that has enter new number or resent contact up there came up I saw that he'd been texting sum 1 he calls "christy 'freaky white girl'" and another girl he calls "sexy erika" & this was a total turn off... I didn't want to bring it up until I had enough evidence but he keeps asking wats wrong I love him and I don't want to break up wit him but I got to know if he's cheatin

Ask him about it, and let him know that him calling other girls "sexy" hurts your feelings and bothers you.

Be upfront with him about your feelings. That's the only way that he will know your suspicions and you two can get it out in the open. Then go with your gut.

He was texting people he calls "sexy" and "freaky" so I doubt it was about homework...

Watch for other things like does he disappear for times that you have no idea where he is or what he's doing. Does he try to hide other things or make excuses for things that make you wonder what is he really up to?
Sometimes girls get all paranoid that the guy is cheating 'because' of whatever they find but when they look at it objectively they release he is always with them and doesn't have time for anybody else or something like that.

I think a talk with him is well needed.

I'm a guy
I'll be honest with you.
HE'S CHEATING
PLAIN AND SIMPLE
If he's not actually involved with any other girl, its just a matter or time, to be honest a matter or days really cause he wants to get in there pants.

Find any one who disagrees

How long have you been together?

Maybe they are past girlfriends?

The only way you are going to know is if you ask him about it.
Like Torrid said, say you saw a name in his phone that had "sexy" in front of it and that you didn't like it. See what he has to say.

Yes I agree he is saying sexy erika and those things waiting for somebody to suggest more. He may not be cheating now but once someone takes the bait and says com'mon then he's going to cheat,

Even if he isn't cheating, he is leading up to it. Why would he tilt the phone away from you? Why would he have one girl listed in his phone as "sexy" Why isn't he talking about these friends of his? I think if he isn't cheating then he is being disrespectful to you in doing this. Not to mention if you ask him and he lies to you about it? Even though you saw it. If he isn't up front about it I might be concerned.

I'm sorry to tell you this but he's totally cheating I have a lot of expierience with cheaters you need to leave him.. "Once a cheater always a cheater" good luck and I hope you do okay.

He is cheating girl so you should just move on