Good ol' Nicolas makes some good points, but I'll try to add some of my own input, too
1. I get jealous easily especially when my bf/gf roleplays with others all the time and i feel like they are neglecting me
Although there's nothing wrong with online relationships, he made some good points about people not necessarily taking them seriously. Communication is key here: before you start dating, establish what you both want out of the relationship. Are they looking for long-term, short term, or just someone to get art with? Is it a relationship that extends to real life, or is it just a roleplay thing? Furries are pretty notorious for having roleplay/online only relationships, and while there's nothing wrong with that, it can lead to hurt feelings if all parties aren't on board with what's going on.
You should also be discussing commitment rules/concerns before you start. A lot of people don't consider RPing cheating, so its best to establish rules regarding that
before something happens. Trust me, its a lot easier to respect boundaries than it is to wind up in a big fight because your partner(s) didn't realize RPing with a friend would hurt you so much.
2. When they are having problems in life i provide the truth and some times i don't sugar coat it.
You might need to elaborate on this. Honestly, I'm picturing someone telling their SO to "get the **** over it" when they're crying or something. If someone's having an anxiety attack, for example, the last thing they want to hear is how "its not that bad" or "just get over it already." There's nothing wrong with trying to honestly help, but its all about the timing. You'll need to learn to read your partner more (something that comes with time), and be able to tell when its okay to sugarcoat things, and when it's okay to be blunt.
If its still a problem, bring it up. Tell your partner that you prefer to tell the direct truth instead of sugarcoating everything, and that you might need help being reminded to be more gentle. Nobody wants bluntness
all the time. If your partner is especially sensitive, work to find a middle ground ("I'm not going to sugarcoat things, but I will watch my language and tone of voice so I don't upset you further") so you're both happy. The key is not changing yourself, but each finding a way to compromise to make the other their happiest.
3. when i have a bad day or something goes wrong and i want help i expect my partner to be there for me and when they aren't i get upset.
Again, communication is key here. Do you tell your partner directly you're having a bad day, or do you expect them to just pick up on hints? Hints never work as well as people think they do
Sometimes it might take you straight-up saying "I've had a rough day, can you please make some time for me?" You both also need to be clear on what "being there for you" means: do you want them to talk to you one-on-one for the rest of the night, or would you rather play a game together? Everyone has different requirements for support, so its possible your partner just doesn't
know how to support you. Like the first question, its all about setting up guidelines and answering questions
before problems arise
Hope I made sense, and hopefully this will help some