Most Helpful Guy
That's pretty clear indications that he is working on other girls on the side. That's not just suspicious, it's way beyond that. That chance that he is talking to other girls, and probably trying to pursue an actual relationship with other girls, is probably close to 100%, given what you have explained here.
He is clearly lying to you, that's obvious. This really sounds like it is a dead relationship - you are pouring your emotions and your energy into a bucket that has a hole in the bottom.
Most Helpful Girl
Yes i likes the other girl, Being long distance at this age give him the opportunity to flirt with other girls and it just seem like he don't want them to know he have a girlfriend