Chemistry: If you are dating someone who is “too serious,” then there must have been something initially attractive about the seriousness. Maybe their intensity meant super-romantic dates. Or maybe it means your partner is very successful because they take their work seriously. However, something must’ve triggered or annoyed you recently, and perhaps your bubble is now bursting. So don’t judge your relationship by your early chemistry, but rather by your chemistry today and tomorrow. Do you still really enjoy nearly every minute with your partner? Is their seriousness making it a chore to be with them? Or is it just a matter of random annoyances here and there?
Character: A more serious person probably takes things like trust, respect, and responsibility very seriously. So consider that this is likely a good benefit to dating someone who is “too serious.” However, it’s important to make sure that their seriousness isn’t a cover for actually having bad character traits. There are many people who exude a lot of intensity or righteousness, but it’s simply a way to push the attention away from themselves and make other people feel guilty.
An excess of seriousness can also lead to poor marks in fairness and caring. If your partner is constantly emphasizing the way things should be, taking on a “my way, or the highway,” attitude, then that is selfish. Even if you make mistakes, you should still be getting your way roughly half-of-the-time. Also, if they annoy people around them with their seriousness, then it shows they don’t care about other people’s enjoyment.