Emotional unavailability bf

Hey I need help before I make a bad decision. Me and my boyfriend was in a healthy relationship but we tended to not see eye to eye most times and would argue. Those arguments increased and we decided to break up. 2 months later we got back together and everything was perfect. We are now 3 weeks back into our relationship but things have been kinda rough for these past days. He is not as emotionally available as he was at first & communication is like before. He tends to take forever to text back now and respond less. He said he loves me but not moreso Inlove anymore right now. Said he can’t be as vulnerable right now as he was before. Everytime I mention something about the relationship or his feelings , he disregard the conversation. He keeps telling me be patient and that we will be okay in the long run. He doesn’t reassure me or anything no more. Im feeling unhappy at the moment now. Idk if I should wait and be patient because I have to remind myself good things take time and remember that we JUST got back together 3 weeks ago. But my overthinking is telling me to just let the relationship go because he isn’t being vulnerable, etc. His energy is kind of alright in person but through text , he barely gives me the time or attention. Anyways he gave me flowers for Valentine’s Day.