Am I over reacting?

Ladies I need some help here.

I fully love this man with everything I have and am. He says he loves me and only me, he wants to be with me and nobody else. He's in love with me completely. But yet he's commenting on other girls pictures, "hot" "beautiful" and all the emojis, ( 😉😍 ) such and such.

Of course I want to trust him, but I can't let him in fully and be with him, and give my whole heart to him in fear of him breaking it. My mental health is ridiculous already, I'm a state and I never feel good enough.

Please, what would you do in this situation. Am I over reacting?

Should I take a chance on him? I want to so badly, but I don't know how I'll cope if he breaks my heart.