My big heart is ruining me

I have a big heart and it’s the worst. Everything makes me so upset and breaks my heart. It’s ruining my happiness! For example if I hear about a dog at the shelter who needs to be adopted I cry and think of some way to help and it ruins my day. If I see an older person alone I’m sad for hours. Even if it’s just a sad Facebook post I’m in a sad mood the rest of the day. I literally spend so much money donating to random charity and stuff trying to do my part to help animals and people and I’m spending all my money and constantly being sad and obsessing over helping sad situations and I don’t know how to make it stop. I get it’s not a horrible thing but it’s really taking a toll on my life. The strange thing about it all is I wouldn’t consider myself like an overly nice person, I don’t know if that makes sense but I have mean moments and people I’m friends with I’m much less empathetic but with strangers and especially dogs I’m so compassionate it’s killing me. I don’t know what to do. This is a weird issue I know so maybe I’m alone but I just always want to give and do give and then it’s never enough to save everything and everyone and it makes me so sad. It’s also hurting my relationship because I want to foster dogs and my boyfriend does it and I feel like he’s trying to fight me on helping animals and idk I’m so torn