I met someone online and we have been on three dates so far. He’s nice and attentive, but there are also some flashes of anger and rude behaviour that make me wary about him. I don’t know if he is being honest about who he is and just pretending to be nicer than he actually is. Last week, at the end of our date, he told me that he likes me and asked if I would consider getting into a relationship with him. I don’t know if I should commit or ask for time because of what I think are red flags. There’s nothing specific I can pinpoint which is why I don’t know what to say to him. How do I find out if I’m making the right decision?
If you aren’t comfortable, that’s what you should focus on because a relationship shouldn’t begin without the right intentions and willingness to work on something. You may not have anything specific to worry about, but the fact that you have doubts shouldn’t be brushed aside because you are picking up something that makes you wary. There are all kinds of non-verbal cues that people put out, and our bodies sometimes catch what we can’t. If you are not sure, tell him that, and ask for time because that is the best way to figure out if someone’s putting on an act. You are under no obligation to commit to anything and if he isn’t comfortable with the idea of waiting, your decision will be justified. Don’t be afraid to ask for time and space because you owe that to yourself.

Should I keep trying to get into a stable relationship with a guy who says we are just friends with benefits?
That is entirely up to you because you are presumably doing this with your eyes open. If it isn’t giving you what you need and he isn’t willing to commit to anything more, ask yourself why you are okay with this arrangement and why it isn’t working.