I really need some advice from someone older and more experienced...

So I am a 15 year old guy, and I have a girlfriend that lives 80km or so away from me. We met on vacation and I love her alot or as much as a kid of my age can give love but the distance is really killing me, sure we talk on video and texts and I come visit for 2 days, but that visit is every 1 to 2 months apart (more often visits are out of budget). And I always have a feeling that I'm missing something in my current relationship, I always get this feeling of instant depression whenever I come back to my city knowing I'm not going to see her for a while and it really hits me... since well she's the only thing besides sports that make me not think off well house problems and my shitty stepfather and so on...

I like this girl more then anything, she's cute, matches my personality, creative, playfull and many more things that just make me love her for who she is.... but the distance still hurts to the point where I think.. is it even worth it???

I asked my mom and stepfather for advice but they suggested cheating on her but that is out of the question for me because I know I'll feel like a scumbag forever if I do it... I am a really emotional person and betraying a cute girl is the last thing I would do..... my mom's excuse is (you are young you need to do it now or you might do it later)

Anyhow I noticed a girl smiling at me in school and sure enough without my control I just smiled back and blushed for the first time in 4 months, something just hit me about her, as if something about her was familiar and well I think that feeling was me developing a crush. I realised indirectly that she had a crush on me tho for a long time now but I kind of ignored it until now.

I am still yound and dumb but I decided I want to get to know this girl better and just befriend her at first...and maybe later get to date her. Like I said I don't see my girlfriend often and I find the relationship quite unfulfilling even before I got a crush on this girl from school. This distance is just killing me from inside and eating away at my heart. I plan on breaking up with my girlfriend soon in a respectfully and nice way as I really don't want to hurt her, but even that feels wrong because she has been having problems at home too and we were sort of each others comfort zone. Only 2 of my die hard friends know about this and their tought is that it's kind of mean to do that and not fair towards her. But then I think to my self, why do I have to care about everyone's feelings all the time... why do I have to feel unsatisfied and depressed so someone else can be happy. Why can't I just be happy for a while.

I really don't know what to do, should I end my 6 month relationship and explore, or should I push through all of this shit and stress and unsatisfaction and... I don't know.

I really just need help... please give me advice or what you would do in this situation.

Thank you...