Me and this HB8.5 have been on and off for a good solid year now.
Lately, I started acting like I didnt really care about her (not in an asshole kind of way) and that she wasnt a priority and so she's been trying harder then ever before to get me.

Now we kiss and hang out fairly often, almost like we're becoming a couple but in the past when we're at this point she starts to lose interest and things die down. How do I keep this from happening again?
Usually she's the one that chases me but I feel once I show the slightest amount of interest back she feels she has me and she gets bored. There's lots of details. Any hellp?

Prioritize other things besides her, don't hang out so much because then it will get boring, either she'll get used nd bored of you or vice versa, let her keep chasing you, that's what you want, show her you have other options

Thanks for the advice man, we hang out maybe once a week if that cuz we're both pretty busy, do you still think thats too much?

And as for texting and keeping in contact and everything, shes always the one who texts me first and tries to talk for the duration of the day but I've noticed since we're taking things a little further thats kinda dying down, shes told me a couple times shes feels that she always texts me first but feels like shes bugging me so she'll wait for me to text her and I never do, should I change what I'm doing in regards to that?

I think I'm just having a hard time balancing keeping her interested/playing hard to get and acting like im not interested at all ya know?

Your thinking about it too much, don't play hard to get so much cus eventually she'll notice, be a gent sometimes, ask her about her day, keep it short and then end the convo, once a week is perfect so she ain't used to seeing you and when she does she'll be really excited, she's into you, that's all you Gota know, so keep it simple, don't prioritize her, let her know your a busy guy but you still will make time for her, and when your with her do something new, keep her guessing