Emotionally confused

I’ve been with my boyfriend for 5 years, we’ve broken up once. Things have been going rough the past couple months and I’m just emotionally exhausted. I still love him but I’m tired of always seeming to put his feelings first. I met a girl a couple months ago and we really hit things off. We hang out a couple of times a week and we’ve talked a lot. We both really like eachother but we’ve set boundaries. I feel so confused because thinking about leaving my boyfriend hurts and I feel awful about thinking it. But when I’m with this girl I feel great. She makes me laugh and she gives me butterflies and I’m VERY attracted to her. I find it extremely difficult to stay away from her and to control myself around her. Any advice on this situation?