Should i dump him?

It's your choice.

If you want the free hint: if I were in a relationship that didn't make me happy, I would leave it.

Drop him like shit from a tall horse.

Dump him like a big, brown log full nuts and corn!

"My long distance boyfriend of three years is texting other girls and lies to me about it ever since he went to college. "

Your relationship died awhile ago and in your heart you know it, sorry.

His actions tell you everything:

"Hes randomly sexually interested in me now when it used to literally be 24/7, now half the time he will avoid it and change the subject if i say anything. "

Young guys need to fuck all the time as you previously saw.
The fact that he's not wanting to fuck you like before means he's fucking someone else.

Besides using you for a girl on the side/lay this guy may end up giving you STDs because he clearly doesn't give a shit about you.

Long distance relationships never work, especially those at college.

College is a big fuck festival for young horny people. It's the first time horny young people aren't living with their parents. Do you really think your guy isn't trying his hardest to fuck a bunch of hot young college sluts?
The fact that you know how horny he was for you and now isn't tells you he's fucking other girls.

Don't kid yourself. Grow up and move on.
He's not 'your guy' anymore.

I'm sorry.

If you really wanted to know you should contact those girls he calls.
If you're nice to them and let them know your his gf and ask them what's up if he's been fucking her or other girls one of them may actually tell you the truth.

Bottom line you deserve better. Chalk this up to a learning experience and get a new guy.

You cannot hold a man's attention long term without meaningful compromise.

I had a distance relationship once. One day, I just suddenly got tired of wasting my time and money on lengthy commutes; of wasting my emotions and intellect on unneeded drama completely unrelated to me.

I gave her an ultimatum; either come live with me for at least a year to see if it works out or stay back in your hometown taking care of your super extended family's many, many bullshit problems, forever.

She chose to stick to her comfort zone of course, but about once or twice a year she still insists on commuting a thousand miles just to get her due maintenance, though I no longer initiate any texts or calls, just reply; women are weird like this.

So either give your guy space, an ultimatum, or make some kind of compromise. Heavens forbid, if you actually 'love' this guy don't tell him, show him. Make some arrangements, go visit him. Let him know that he's actually more important to you than your smartphone.

Dump him, he's over you. College has got to his head, the whole "freedom" aspect is causing him to leave you behind. He's going to have the college experience whether you like it or not, you should cut ties now, I guarantee from what you've just posted, it's only going to get worse from here

not a phase. he's using you. move along before you regret wasting anymore time on him. he's obviously moved on already and just keeps you on the hook for the benefits.

This, like, totally sounds like a perfect relationship. And a perfect end to a teenage tryst.