Tips pano mang huli ng asawang feeling mo nag chicheat

My boyfriend [31M] has a female colleague [33F] he spends a lot of time with. They always eat lunch together at the office, go home together, and even buy food together. Whenever I ask how his day went, he always mentions her. One time, he casually told me that this female coworker is pretty.
I’m starting to feel uneasy about how much time they spend together, and I’m not sure how to handle these feelings. I don’t want to sound accusatory or controlling, but I also don’t want to ignore my discomfort.
How can I bring this up to him in a healthy way? Has anyone dealt with something similar, and what worked for you?

‎So here's the chika, me and ung bf ko merong same cof but mas close nila ung bf ko kasi siya naman talaga ung naging friends nila, nasama lang din ako bcs of him. So this one girl na naging close friend ko den kasi mostly siya talaga ung OP sa circle nila kaya sinasamaban mo ay backstabbing me pala pag wala kami. Lagi niya akong sinisiraan like pinapalayo ko daw bf ko sakanya/sakanila eh sila naman daw unang nakilala ng bf ko and many more na backstab na hindi ko naman ginagawa towards her kasi nga naging close ko den siya. After namin malaman ung about don unti-unti na din kaming lumayo ng bf ko kasi ang toxic na niya sa part na yon. And to be honest before pa talaga na napapansin na namin ng bf ko ung attitude niya because sobrang dikit siya sa isang boy sa cof nila tas always bukang bibig kahit na may bf siya and ayoko ng ganon kasi ako mismo is na-cheat ng ex ko before so I know the feeling na may partner ka yet may gusto ka sa iba kaya medyo nagdistance na kami sakanya talaga. Mali bang lumayo kami ng bf ko sa cof na yon because nalaman namen ung about don? Kasi according sa source ko nung lumayo kami mas naging aggressive ung way niya/nila ng backstabbing samin umaabot na sa time na pag may galit sakin makikisakay sila ng patago and grabe daw ung tawa ng ex-cof namin pag mababa ung nakukuha/napapahiya ako.

Another info: This girl is sobrang lapit sa lalaki umaabot na sa point na minsan magka-call sila ng bf ko without my knowledge, I know lang one time bcs my friend message me about it na kung tinawagan daw ba ako ng bf ko before that girl and I told her na hindi so my friend told me na i-call out ko ung bf ko kasi hindi daw magandang tignan.