NL cash game, i have about $2400, matey boy has around $3k.
Mateyboy is very tight/ semi aggressive and on the button when i am in the BB
2 limpers, mateyboy raises on the button 3 x the BB
I have

and expect the limpers to call, so i call and the limpers follow suit.
Flop

I bet out around half the pot
1 limper folds and the other min raises
Mateyboy calls and so do i.
turn is

I check
Limper checks
matey boy checks
River is

I bet 2/3 the pot (about $600 with around $300 already invested)
Limper calls (with around $600 back)
Mateyboy moves all in
eeeeeeeeeekkkk
What to do?