<human>: Can you summarize the given text in a few sentences?

This is my first relationship... ever

We were both around 16 at the time we started our relationship... I really enjoyed it and I was happy with it

But the last year I'm really struggling with his sexual needs... He wants to be free, sexting with other guys and even have sex with them... It really broke me and I really tried to accept it for what it is... but I just can't :/ I told him I don't want a non-monogamy relationship, but I feel like it's just getting ignored and he just does whatever he wants

Troughout this year he's texting with alot of guys and even when we're together I feel like he's really enjoying the texting more than he's enjoying me sitting next to him

He has even been sexting... even when he's masturbating he's talking with these guys, he says it's the same experience as watching porn, but I'm sure it's not the same... he's sexting any free time he has... even when he's sitting next to me

I just can't take this... and when I want to talk about it he's like "I'm not in the mood to talk about this" and when I'm asking when he'll be in the mood to talk about it he says "I don't know" kind of like he's dodging the talk with me

I take care of him, pay stuff for him, make sure he's enjoying his time with me... But I feel like I do not get rewarded for it...

Breaking up is really the last resort...

Maybe something else can work, or is this just hopeless?
<bot>: BF wants a non-monogamy relationship and I don't... I told him, but he seems to ignore it, he's already sexting and I can't make a stop to this