Will my friends relationship work out?

Well he has a girlfriend but she lives like 8 states away and they literally only see eachother a couple times a year. They are both 18 and met online through a chat forum.

The girl always is commenting on his facebook photos that she loves him etc etc but my friend never replies to her or anything. Also last summer he complained alot about her and how he didnt see himself being with her because he isnt a fan of the field of work she wants to go into. Also at that time he always wore a necklace she gave him but now he doesnt wear it ever.

He still talks to her...but when me and him hang out he ignores her texts and from what I hear she is in a abusive situation at home so sometimes I feel like he is staying with her out of guilt.

Idk he seems like he isnt interested sometimes but he is flying all the way out there to take her to her prom so I really dont know?

Also he texts me until 5 am...and I feel kinda bad for his girlfriend because I know it would be wierd if my boyfriend texted another girl all night. Idk I feel sometimes like hebstays with her out of comfort just so he wont be single.