We're assuming Hollywood style "happily ever after" style love first.
It's rare. Very rare. Not because it's reserved for some special "selected people", but because it's less love and more of an obsession, an unhealthy one at that. A person cannot be perfect enough to love and worship unconditionally like that for eternity.
Alright, how about normal love with the occasional fight?
That's definitely more doable.
You'd obviously have to work for it - prove to your interest you're worthy. The easiest analogy for the work I can think of right now is in internet, specifically, modern internet - THC handshakes: both parties do their part, prove they're there for each other. Games like stardew valley make it look way too easy: grow a massive field of pumpkins, feed abigail a pumpkin every day for a week (I think), and then she's ready for marriage and producing a child.
I haven't played stardew, I don't remember if there are children.
Real love is a pain in the ass - there's the first date, there's the few dates after to get comfortable with each other, there's the romantic date period, there's the casual dating (all my info on this comes from movies and cheesy lovey-dovey webcomics, for the record), you can't just force-feed your love interest pumpkins.
...
...
I mean, you can, it's just advised against...
So, all in all love, real love, not hollywood bullshit is definitely achievable, it's just not as easy as romcoms and video games make it look.
