I never ask for help but this time I need it..

       Ok so I'm in a relationship (4 1/2 years) and things "were" great. I live with him, work with him (he's my boss), and I'm constantly around him. Idk I just can't act like myself around him. When I go visit my mom I'm happy and I'm myself. 
     While I was over there I met a guy that makes me happy and I love being happy again. BUT being happy makes me miss my comfort place which is back with my boyfriend. I'm thinking and thinking and I want to leave but it's hard because it's my comfort zone. Can I get some helpful advice. Please no rude comments. Thank you