I love my boyfriend but he can't make me cum anymore

I am in love with my boyfriend and we're both really attracted to each other but we're having difficulty pleasuring each other reccently.

Or more so, I just can't cum for him when he fingers me like I used to be able to.

Any tips or advice on why this might occur?

We're open to trying new things. Past couple months I've been really into using a vibrator which may have made it more sensitive down there? But still finding I can't cum even with that.