Is my boyfriend cheating?

So I’ve never really been able to trust my boyfriend we’ve been together 3 years and have a 2 month old baby together part of the trust issues are my own reasons but in the 3 years I’ve never heard anything about him cheating on me. his friends are constantly telling me he’s not that guy and he never blinks an eye at another girl but I don’t know if there just telling me that to help him out and be a good friend to him and sweet talk me. So yesterday I was speaking to his friend and he slipped up and told me one of his friends had been to a brothel with another friend who’s girlfriend is pregnant he said when they discuss it it goes in my boyfriends ear and out of another. The guy that told me also has a girlfriend and When I asked him has he been He said yes he got one of a website and paid £40 but said he felt disgusting after it but I never asked if it was while he was single or not. See after this now my trust issues have gone even worse I can’t even look at him in the same way now knowing his friends are doing that dirty and some behind their girlfriends back. I feel now I I’ll never be able to trust him. Do you think he’s doing the same with his friends and he was trying to warn me? What would you do in my position ? I don’t think I’ll be able to look at him the same now and I personally wouldn’t be friends with people that did that if I wasn’t a cheat myself ? Help please