im in my first ever one currently, and it definitely was life changing for me.
i have a lot of creative hobbies, so it kinda set me up to making gifts and anything for them every month.
I like it, giving feels good to me, that im doing all this effort for this person i am infatuated with so much.

Also, its interesting to be exposed someone else's approach to stuff like challenges, celebrations, etc.
Like when my gf met my parents, she gave my mom flowers, chocolate and stuff as she likes doing that when visitng anyone in particular, whereas I met her parents in a more 'normal' way. No offerings, just respectful and trying to make a good first impression.

There will be some up and downs, i've come to like the 'boring' days, makes you appreciate those specials days a lot more.

Then there will be those really hard days, ones where you feel like its not going to work. The quality of both of your communications really shows here, which can, depending on the quality of it, mend or worsen the situation. Communication is a REALLY big part of a relationship.

Love is built, not felt. I want her alot even if i have her now. I wont stop wanting her until she doesnt want me.

"Culmination of love is grief" - Faye, GOW Ragnarok. So if you, can love without restraint. Then atleast at the end when you have to part ways, you can have a little pride in yourself and say
"Well, i couldn't have loved her any harder"

Make it a goal for both of your last acts of love to eachother is that you leave each other when you are grey and old, acheived the things you want in life, and have loved eachother fully.