My girlfriend and I been together for 4 years I will always try to make her feel comfortable and safe in during intercourse ill always ask if she's ok or if I was hurting her she's the boss but last night while we was making love she starts crying covering her face I stopped and ask her what was wrong she just said nothing so I just hold her we were both naked I decided to cover her up and today she acted as if everything is normal should I bring up what happened last night or should I just let it go?

What do i do?