Communicate with your boyfriend. If all the signs are there, direct communication is the only avenue. Ask him if he is happy. Sometimes his response to the question might be all you need. If he is sincerely confused you would ask him such a question, he is probably happy in the relationship. If he tells you he is happy and asks you why you think he isn't, take his concern as a positive response.
When something comes up in life, whether that's a work event or any accomplishment and your partner isn't the first person you're sharing it with — or one of the firsts, Fleming says that it may be that "you prefer to get your needs mets outside the relationship." To that end, Greer points out that not having any meaningful conversations aside from "rudimentary conversations about chores and things that need to get done" is a warning sign that your relationship is not in a good place.