I fucked up big time

So me and my boyfriend have been together since we was 14 and we are now 19 so 5 years in July we have such a strong relationship and I love him with every bone in my body.....but I have started this new job and there is this boy who I don't see all the time just holiday club but he was being a teen he's 17 btw and was play fighting with me ( I would never go with a 17 year old in the first place keep in mind) and I play fighted back with him I grew up with older brothers and we always play fight it was no big deal until I told my boyfriend and he went mad and said I was flirting with him and I said maybe a little but I'm always over friendly thats just me I never know where the line is but it's wasn't like I want to kiss him or even be with him I love my boyfriend so much I would never cheat... any way he treated to brake up with me I was crying said I was sorry and now we are back to normal he has forgave me but I feel like I have fucked up everything we was trying for a baby because we have already lost 2 but now I feel like I let us down and we need to focus on us a little bit more.. I feel like i have cheated on him and I don't know what to do.. he's acting fine like nothing happened but I can't get over the feeling I know I fucked up and the one thing I never wanted to do was hurt him and I did it and I only thing I wanted in the world was to become a family and I fucked up that to.. I don't know what to do I don't no how he's acting normal when I feel so bad about it..

Ladies feel free to say I'm dumb,stupid, wrong for flirting because I already know that